chore: virtualization ish behaviour for issue layouts (#3538)

* Virtualization like core changes with intersection observer

* Virtualization like changes for spreadsheet

* Virtualization like changes for list

* Virtualization like changes for kanban

* add logic to render all the issues at once

* revert back the changes for list to follow the old pattern of grouping

* fix column shadow in spreadsheet for rendering rows

* fix constant draggable height while dragging and rendering blocks in kanban

* fix height glitch while rendered rows adjust to default height

* remove loading animation for issue layouts

* reduce requestIdleCallback timer to 300ms

* remove logic for index tarcking to force render as the same effect seems to be achieved by removing requestIdleCallback

* Fix Kanban droppable height

* fix spreadsheet sub issue loading

* force change in reference to re render the render if visible component when the order of list changes

* add comments and minor changes

packages/types/src/issues.d.ts

@@ -221,3 +221,12 @@ export interface IGroupByColumn {
 export interface IIssueMap {
   [key: string]: TIssue;
 }
+
+export interface IIssueListRow {
+  id: string;
+  groupId: string;
+  type: "HEADER" | "NO_ISSUES" | "QUICK_ADD" | "ISSUE";
+  name?: string;
+  icon?: ReactElement | undefined;
+  payload?: Partial<TIssue>;
+}

web/components/core/render-if-visible-HOC.tsx

@@ -0,0 +1,80 @@
+import { cn } from "helpers/common.helper";
+import React, { useState, useRef, useEffect, ReactNode, MutableRefObject } from "react";
+
+type Props = {
+  defaultHeight?: string;
+  verticalOffset?: number;
+  horizonatlOffset?: number;
+  root?: MutableRefObject<HTMLElement | null>;
+  children: ReactNode;
+  as?: keyof JSX.IntrinsicElements;
+  classNames?: string;
+  alwaysRender?: boolean;
+  placeholderChildren?: ReactNode;
+  pauseHeightUpdateWhileRendering?: boolean;
+  changingReference?: any;
+};
+
+const RenderIfVisible: React.FC<Props> = (props) => {
+  const {
+    defaultHeight = "300px",
+    root,
+    verticalOffset = 50,
+    horizonatlOffset = 0,
+    as = "div",
+    children,
+    classNames = "",
+    alwaysRender = false, //render the children even if it is not visble in root
+    placeholderChildren = null, //placeholder children
+    pauseHeightUpdateWhileRendering = false, //while this is true the height of the blocks are maintained
+    changingReference, //This is to force render when this reference is changed
+  } = props;
+  const [shouldVisible, setShouldVisible] = useState<boolean>(alwaysRender);
+  const placeholderHeight = useRef<string>(defaultHeight);
+  const intersectionRef = useRef<HTMLElement | null>(null);
+
+  const isVisible = alwaysRender || shouldVisible;
+
+  // Set visibility with intersection observer
+  useEffect(() => {
+    if (intersectionRef.current) {
+      const observer = new IntersectionObserver(
+        (entries) => {
+          if (typeof window !== undefined && window.requestIdleCallback) {
+            window.requestIdleCallback(() => setShouldVisible(entries[0].isIntersecting), {
+              timeout: 300,
+            });
+          } else {
+            setShouldVisible(entries[0].isIntersecting);
+          }
+        },
+        {
+          root: root?.current,
+          rootMargin: `${verticalOffset}% ${horizonatlOffset}% ${verticalOffset}% ${horizonatlOffset}%`,
+        }
+      );
+      observer.observe(intersectionRef.current);
+      return () => {
+        if (intersectionRef.current) {
+          observer.unobserve(intersectionRef.current);
+        }
+      };
+    }
+  }, [root?.current, intersectionRef, children, changingReference]);
+
+  //Set height after render
+  useEffect(() => {
+    if (intersectionRef.current && isVisible) {
+      placeholderHeight.current = `${intersectionRef.current.offsetHeight}px`;
+    }
+  }, [isVisible, intersectionRef, alwaysRender, pauseHeightUpdateWhileRendering]);
+
+  const child = isVisible ? <>{children}</> : placeholderChildren;
+  const style =
+    isVisible && !pauseHeightUpdateWhileRendering ? {} : { height: placeholderHeight.current, width: "100%" };
+  const className = isVisible ? classNames : cn(classNames, "bg-custom-background-80");
+
+  return React.createElement(as, { ref: intersectionRef, style, className }, child);
+};
+
+export default RenderIfVisible;

web/components/issues/issue-layouts/kanban/base-kanban-root.tsx

@@ -1,4 +1,4 @@
-import { FC, useCallback, useState } from "react";
+import { FC, useCallback, useRef, useState } from "react";
 import { DragDropContext, DragStart, DraggableLocation, DropResult, Droppable } from "@hello-pangea/dnd";
 import { useRouter } from "next/router";
 import { observer } from "mobx-react-lite";
@@ -94,6 +94,8 @@ export const BaseKanBanRoot: React.FC<IBaseKanBanLayout> = observer((props: IBas
 
   const { enableInlineEditing, enableQuickAdd, enableIssueCreation } = issues?.viewFlags || {};
 
+  const scrollableContainerRef = useRef<HTMLDivElement | null>(null);
+
   // states
   const [isDragStarted, setIsDragStarted] = useState<boolean>(false);
   const [dragState, setDragState] = useState<KanbanDragState>({});
@@ -245,7 +247,10 @@ export const BaseKanBanRoot: React.FC<IBaseKanBanLayout> = observer((props: IBas
         </div>
       )}
 
-      <div className="horizontal-scroll-enable relative h-full w-full overflow-auto bg-custom-background-90">
+      <div
+        className="flex horizontal-scroll-enable relative h-full w-full overflow-auto bg-custom-background-90"
+        ref={scrollableContainerRef}
+      >
         <div className="relative h-max w-max min-w-full bg-custom-background-90 px-2">
           <DragDropContext onDragStart={onDragStart} onDragEnd={onDragEnd}>
             {/* drag and delete component */}
@@ -289,6 +294,8 @@ export const BaseKanBanRoot: React.FC<IBaseKanBanLayout> = observer((props: IBas
               canEditProperties={canEditProperties}
               storeType={storeType}
               addIssuesToView={addIssuesToView}
+              scrollableContainerRef={scrollableContainerRef}
+              isDragStarted={isDragStarted}
             />
           </DragDropContext>
         </div>

web/components/issues/issue-layouts/kanban/block.tsx

@@ -1,4 +1,4 @@
-import { memo } from "react";
+import { MutableRefObject, memo } from "react";
 import { Draggable, DraggableProvided, DraggableStateSnapshot } from "@hello-pangea/dnd";
 import { observer } from "mobx-react-lite";
 // hooks
@@ -13,6 +13,7 @@ import { TIssue, IIssueDisplayProperties, IIssueMap } from "@plane/types";
 import { EIssueActions } from "../types";
 // helper
 import { cn } from "helpers/common.helper";
+import RenderIfVisible from "components/core/render-if-visible-HOC";
 
 interface IssueBlockProps {
   peekIssueId?: string;
@@ -25,6 +26,9 @@ interface IssueBlockProps {
   handleIssues: (issue: TIssue, action: EIssueActions) => void;
   quickActions: (issue: TIssue) => React.ReactNode;
   canEditProperties: (projectId: string | undefined) => boolean;
+  scrollableContainerRef?: MutableRefObject<HTMLDivElement | null>;
+  isDragStarted?: boolean;
+  issueIds: string[]; //DO NOT REMOVE< needed to force render for virtualization
 }
 
 interface IssueDetailsBlockProps {
@@ -107,6 +111,9 @@ export const KanbanIssueBlock: React.FC<IssueBlockProps> = memo((props) => {
     handleIssues,
     quickActions,
     canEditProperties,
+    scrollableContainerRef,
+    isDragStarted,
+    issueIds,
   } = props;
 
   const issue = issuesMap[issueId];
@@ -129,24 +136,31 @@ export const KanbanIssueBlock: React.FC<IssueBlockProps> = memo((props) => {
           {...provided.dragHandleProps}
           ref={provided.innerRef}
         >
-          {issue.tempId !== undefined && (
-            <div className="absolute left-0 top-0 z-[99999] h-full w-full animate-pulse bg-custom-background-100/20" />
-          )}
           <div
             className={cn(
-              "space-y-2 rounded border-[0.5px] border-custom-border-200 bg-custom-background-100 px-3 py-2 text-sm transition-all hover:border-custom-border-400",
+              "rounded border-[0.5px] border-custom-border-200 bg-custom-background-100 px-3 py-2 text-sm transition-all hover:border-custom-border-400",
               { "hover:cursor-grab": !isDragDisabled },
               { "border-custom-primary-100": snapshot.isDragging },
               { "border border-custom-primary-70 hover:border-custom-primary-70": peekIssueId === issue.id }
             )}
           >
-            <KanbanIssueDetailsBlock
+            <RenderIfVisible
-              issue={issue}
+              classNames="space-y-2"
-              displayProperties={displayProperties}
+              root={scrollableContainerRef}
-              handleIssues={handleIssues}
+              defaultHeight="100px"
-              quickActions={quickActions}
+              horizonatlOffset={50}
-              isReadOnly={!canEditIssueProperties}
+              alwaysRender={snapshot.isDragging}
-            />
+              pauseHeightUpdateWhileRendering={isDragStarted}
+              changingReference={issueIds}
+            >
+              <KanbanIssueDetailsBlock
+                issue={issue}
+                displayProperties={displayProperties}
+                handleIssues={handleIssues}
+                quickActions={quickActions}
+                isReadOnly={!canEditIssueProperties}
+              />
+            </RenderIfVisible>
           </div>
         </div>
       )}

web/components/issues/issue-layouts/kanban/blocks-list.tsx

@@ -1,4 +1,4 @@
-import { memo } from "react";
+import { MutableRefObject, memo } from "react";
 //types
 import { TIssue, IIssueDisplayProperties, IIssueMap } from "@plane/types";
 import { EIssueActions } from "../types";
@@ -16,6 +16,8 @@ interface IssueBlocksListProps {
   handleIssues: (issue: TIssue, action: EIssueActions) => void;
   quickActions: (issue: TIssue, customActionButton?: React.ReactElement) => React.ReactNode;
   canEditProperties: (projectId: string | undefined) => boolean;
+  scrollableContainerRef?: MutableRefObject<HTMLDivElement | null>;
+  isDragStarted?: boolean;
 }
 
 const KanbanIssueBlocksListMemo: React.FC<IssueBlocksListProps> = (props) => {
@@ -30,6 +32,8 @@ const KanbanIssueBlocksListMemo: React.FC<IssueBlocksListProps> = (props) => {
     handleIssues,
     quickActions,
     canEditProperties,
+    scrollableContainerRef,
+    isDragStarted,
   } = props;
 
   return (
@@ -56,6 +60,9 @@ const KanbanIssueBlocksListMemo: React.FC<IssueBlocksListProps> = (props) => {
                 index={index}
                 isDragDisabled={isDragDisabled}
                 canEditProperties={canEditProperties}
+                scrollableContainerRef={scrollableContainerRef}
+                isDragStarted={isDragStarted}
+                issueIds={issueIds} //passing to force render for virtualization whenever parent rerenders
               />
             );
           })}

web/components/issues/issue-layouts/kanban/default.tsx

@@ -20,6 +20,7 @@ import {
 import { EIssueActions } from "../types";
 import { getGroupByColumns } from "../utils";
 import { TCreateModalStoreTypes } from "constants/issue";
+import { MutableRefObject } from "react";
 
 export interface IGroupByKanBan {
   issuesMap: IIssueMap;
@@ -45,6 +46,8 @@ export interface IGroupByKanBan {
   storeType?: TCreateModalStoreTypes;
   addIssuesToView?: (issueIds: string[]) => Promise<TIssue>;
   canEditProperties: (projectId: string | undefined) => boolean;
+  scrollableContainerRef?: MutableRefObject<HTMLDivElement | null>;
+  isDragStarted?: boolean;
 }
 
 const GroupByKanBan: React.FC<IGroupByKanBan> = observer((props) => {
@@ -67,6 +70,8 @@ const GroupByKanBan: React.FC<IGroupByKanBan> = observer((props) => {
     storeType,
     addIssuesToView,
     canEditProperties,
+    scrollableContainerRef,
+    isDragStarted,
   } = props;
 
   const member = useMember();
@@ -92,11 +97,7 @@ const GroupByKanBan: React.FC<IGroupByKanBan> = observer((props) => {
           const groupByVisibilityToggle = visibilityGroupBy(_list);
 
           return (
-            <div
+            <div className={`relative flex flex-shrink-0 flex-col group ${groupByVisibilityToggle ? `` : `w-[340px]`}`}>
-              className={`relative flex flex-shrink-0 flex-col h-full group ${
-                groupByVisibilityToggle ? `` : `w-[340px]`
-              }`}
-            >
               {sub_group_by === null && (
                 <div className="flex-shrink-0 sticky top-0 z-[2] w-full bg-custom-background-90 py-1">
                   <HeaderGroupByCard
@@ -135,6 +136,8 @@ const GroupByKanBan: React.FC<IGroupByKanBan> = observer((props) => {
                   disableIssueCreation={disableIssueCreation}
                   canEditProperties={canEditProperties}
                   groupByVisibilityToggle={groupByVisibilityToggle}
+                  scrollableContainerRef={scrollableContainerRef}
+                  isDragStarted={isDragStarted}
                 />
               )}
             </div>
@@ -168,6 +171,8 @@ export interface IKanBan {
   storeType?: TCreateModalStoreTypes;
   addIssuesToView?: (issueIds: string[]) => Promise<TIssue>;
   canEditProperties: (projectId: string | undefined) => boolean;
+  scrollableContainerRef?: MutableRefObject<HTMLDivElement | null>;
+  isDragStarted?: boolean;
 }
 
 export const KanBan: React.FC<IKanBan> = observer((props) => {
@@ -189,6 +194,8 @@ export const KanBan: React.FC<IKanBan> = observer((props) => {
     storeType,
     addIssuesToView,
     canEditProperties,
+    scrollableContainerRef,
+    isDragStarted,
   } = props;
 
   const issueKanBanView = useKanbanView();
@@ -213,6 +220,8 @@ export const KanBan: React.FC<IKanBan> = observer((props) => {
       storeType={storeType}
       addIssuesToView={addIssuesToView}
       canEditProperties={canEditProperties}
+      scrollableContainerRef={scrollableContainerRef}
+      isDragStarted={isDragStarted}
     />
   );
 });

web/components/issues/issue-layouts/kanban/kanban-group.tsx

@@ -1,3 +1,4 @@
+import { MutableRefObject } from "react";
 import { Droppable } from "@hello-pangea/dnd";
 // hooks
 import { useProjectState } from "hooks/store";
@@ -37,6 +38,8 @@ interface IKanbanGroup {
   disableIssueCreation?: boolean;
   canEditProperties: (projectId: string | undefined) => boolean;
   groupByVisibilityToggle: boolean;
+  scrollableContainerRef?: MutableRefObject<HTMLDivElement | null>;
+  isDragStarted?: boolean;
 }
 
 export const KanbanGroup = (props: IKanbanGroup) => {
@@ -57,6 +60,8 @@ export const KanbanGroup = (props: IKanbanGroup) => {
     disableIssueCreation,
     quickAddCallback,
     viewId,
+    scrollableContainerRef,
+    isDragStarted,
   } = props;
   // hooks
   const projectState = useProjectState();
@@ -127,6 +132,8 @@ export const KanbanGroup = (props: IKanbanGroup) => {
               handleIssues={handleIssues}
               quickActions={quickActions}
               canEditProperties={canEditProperties}
+              scrollableContainerRef={scrollableContainerRef}
+              isDragStarted={isDragStarted}
             />
 
             {provided.placeholder}

web/components/issues/issue-layouts/kanban/swimlanes.tsx

@@ -1,3 +1,4 @@
+import { MutableRefObject } from "react";
 import { observer } from "mobx-react-lite";
 // components
 import { KanBan } from "./default";
@@ -80,6 +81,7 @@ interface ISubGroupSwimlane extends ISubGroupSwimlaneHeader {
     viewId?: string
   ) => Promise<TIssue | undefined>;
   viewId?: string;
+  scrollableContainerRef?: MutableRefObject<HTMLDivElement | null>;
 }
 const SubGroupSwimlane: React.FC<ISubGroupSwimlane> = observer((props) => {
   const {
@@ -99,6 +101,8 @@ const SubGroupSwimlane: React.FC<ISubGroupSwimlane> = observer((props) => {
     addIssuesToView,
     quickAddCallback,
     viewId,
+    scrollableContainerRef,
+    isDragStarted,
   } = props;
 
   const calculateIssueCount = (column_id: string) => {
@@ -150,6 +154,8 @@ const SubGroupSwimlane: React.FC<ISubGroupSwimlane> = observer((props) => {
                   addIssuesToView={addIssuesToView}
                   quickAddCallback={quickAddCallback}
                   viewId={viewId}
+                  scrollableContainerRef={scrollableContainerRef}
+                  isDragStarted={isDragStarted}
                 />
               </div>
             )}
@@ -183,6 +189,7 @@ export interface IKanBanSwimLanes {
   ) => Promise<TIssue | undefined>;
   viewId?: string;
   canEditProperties: (projectId: string | undefined) => boolean;
+  scrollableContainerRef?: MutableRefObject<HTMLDivElement | null>;
 }
 
 export const KanBanSwimLanes: React.FC<IKanBanSwimLanes> = observer((props) => {
@@ -204,6 +211,7 @@ export const KanBanSwimLanes: React.FC<IKanBanSwimLanes> = observer((props) => {
     addIssuesToView,
     quickAddCallback,
     viewId,
+    scrollableContainerRef,
   } = props;
 
   const member = useMember();
@@ -249,6 +257,7 @@ export const KanBanSwimLanes: React.FC<IKanBanSwimLanes> = observer((props) => {
           canEditProperties={canEditProperties}
           quickAddCallback={quickAddCallback}
           viewId={viewId}
+          scrollableContainerRef={scrollableContainerRef}
         />
       )}
     </div>

web/components/issues/issue-layouts/list/base-list-root.tsx

@@ -122,26 +122,24 @@ export const BaseListRoot = observer((props: IBaseListRoot) => {
   );
 
   return (
-    <>
+    <div className={`relative h-full w-full bg-custom-background-90`}>
-      <div className={`relative h-full w-full bg-custom-background-90`}>
+      <List
-        <List
+        issuesMap={issueMap}
-          issuesMap={issueMap}
+        displayProperties={displayProperties}
-          displayProperties={displayProperties}
+        group_by={group_by}
-          group_by={group_by}
+        handleIssues={handleIssues}
-          handleIssues={handleIssues}
+        quickActions={renderQuickActions}
-          quickActions={renderQuickActions}
+        issueIds={issueIds}
-          issueIds={issueIds}
+        showEmptyGroup={showEmptyGroup}
-          showEmptyGroup={showEmptyGroup}
+        viewId={viewId}
-          viewId={viewId}
+        quickAddCallback={issues?.quickAddIssue}
-          quickAddCallback={issues?.quickAddIssue}
+        enableIssueQuickAdd={!!enableQuickAdd}
-          enableIssueQuickAdd={!!enableQuickAdd}
+        canEditProperties={canEditProperties}
-          canEditProperties={canEditProperties}
+        disableIssueCreation={!enableIssueCreation || !isEditingAllowed}
-          disableIssueCreation={!enableIssueCreation || !isEditingAllowed}
+        storeType={storeType}
-          storeType={storeType}
+        addIssuesToView={addIssuesToView}
-          addIssuesToView={addIssuesToView}
+        isCompletedCycle={isCompletedCycle}
-          isCompletedCycle={isCompletedCycle}
+      />
-        />
+    </div>
-      </div>
-    </>
   );
 });

web/components/issues/issue-layouts/list/block.tsx

@@ -48,64 +48,59 @@ export const IssueBlock: React.FC<IssueBlockProps> = observer((props: IssueBlock
   const projectDetails = getProjectById(issue.project_id);
 
   return (
-    <>
+    <div
-      <div
+      className={cn("min-h-12 relative flex items-center gap-3 bg-custom-background-100 p-3 text-sm", {
-        className={cn(
+        "border border-custom-primary-70 hover:border-custom-primary-70":
-          "relative flex items-center gap-3 bg-custom-background-100 p-3 text-sm border border-transparent border-b-custom-border-200",
-          {
-            "border border-custom-primary-70 hover:border-custom-primary-70":
               peekIssue && peekIssue.issueId === issue.id,
-            "last:border-b-transparent": peekIssue?.issueId !== issue.id,
+            "last:border-b-transparent": peekIssue?.issueId !== issue.id
-          }
+      })}
-        )}
+    >
-      >
+      {displayProperties && displayProperties?.key && (
-        {displayProperties && displayProperties?.key && (
+        <div className="flex-shrink-0 text-xs font-medium text-custom-text-300">
-          <div className="flex-shrink-0 text-xs font-medium text-custom-text-300">
+          {projectDetails?.identifier}-{issue.sequence_id}
-            {projectDetails?.identifier}-{issue.sequence_id}
+        </div>
-          </div>
+      )}
-        )}
 
-        {issue?.tempId !== undefined && (
+      {issue?.tempId !== undefined && (
-          <div className="absolute left-0 top-0 z-[99999] h-full w-full animate-pulse bg-custom-background-100/20" />
+        <div className="absolute left-0 top-0 z-[99999] h-full w-full animate-pulse bg-custom-background-100/20" />
-        )}
+      )}
 
-        {issue?.is_draft ? (
+      {issue?.is_draft ? (
+        <Tooltip tooltipHeading="Title" tooltipContent={issue.name}>
+          <span>{issue.name}</span>
+        </Tooltip>
+      ) : (
+        <ControlLink
+          href={`/${workspaceSlug}/projects/${projectId}/issues/${issueId}`}
+          target="_blank"
+          onClick={() => handleIssuePeekOverview(issue)}
+          className="w-full line-clamp-1 cursor-pointer text-sm text-custom-text-100"
+        >
           <Tooltip tooltipHeading="Title" tooltipContent={issue.name}>
             <span>{issue.name}</span>
           </Tooltip>
-        ) : (
+        </ControlLink>
-          <ControlLink
+      )}
-            href={`/${workspaceSlug}/projects/${projectId}/issues/${issueId}`}
-            target="_blank"
-            onClick={() => handleIssuePeekOverview(issue)}
-            className="w-full line-clamp-1 cursor-pointer text-sm text-custom-text-100"
-          >
-            <Tooltip tooltipHeading="Title" tooltipContent={issue.name}>
-              <span>{issue.name}</span>
-            </Tooltip>
-          </ControlLink>
-        )}
 
-        <div className="ml-auto flex flex-shrink-0 items-center gap-2">
+      <div className="ml-auto flex flex-shrink-0 items-center gap-2">
-          {!issue?.tempId ? (
+        {!issue?.tempId ? (
-            <>
+          <>
-              <IssueProperties
+            <IssueProperties
-                className="relative flex items-center gap-2 whitespace-nowrap"
+              className="relative flex items-center gap-2 whitespace-nowrap"
-                issue={issue}
+              issue={issue}
-                isReadOnly={!canEditIssueProperties}
+              isReadOnly={!canEditIssueProperties}
-                handleIssues={updateIssue}
+              handleIssues={updateIssue}
-                displayProperties={displayProperties}
+              displayProperties={displayProperties}
-                activeLayout="List"
+              activeLayout="List"
-              />
+            />
-              {quickActions(issue)}
+            {quickActions(issue)}
-            </>
+          </>
-          ) : (
+        ) : (
-            <div className="h-4 w-4">
+          <div className="h-4 w-4">
-              <Spinner className="h-4 w-4" />
+            <Spinner className="h-4 w-4" />
-            </div>
+          </div>
-          )}
+        )}
-        </div>
       </div>
-    </>
+    </div>
   );
 });

web/components/issues/issue-layouts/list/blocks-list.tsx

@@ -1,9 +1,10 @@
-import { FC } from "react";
+import { FC, MutableRefObject } from "react";
 // components
 import { IssueBlock } from "components/issues";
 // types
 import { TGroupedIssues, TIssue, IIssueDisplayProperties, TIssueMap, TUnGroupedIssues } from "@plane/types";
 import { EIssueActions } from "../types";
+import RenderIfVisible from "components/core/render-if-visible-HOC";
 
 interface Props {
   issueIds: TGroupedIssues | TUnGroupedIssues | any;
@@ -12,27 +13,34 @@ interface Props {
   handleIssues: (issue: TIssue, action: EIssueActions) => Promise<void>;
   quickActions: (issue: TIssue) => React.ReactNode;
   displayProperties: IIssueDisplayProperties | undefined;
+  containerRef: MutableRefObject<HTMLDivElement | null>;
 }
 
 export const IssueBlocksList: FC<Props> = (props) => {
-  const { issueIds, issuesMap, handleIssues, quickActions, displayProperties, canEditProperties } = props;
+  const { issueIds, issuesMap, handleIssues, quickActions, displayProperties, canEditProperties, containerRef } = props;
 
   return (
     <div className="relative h-full w-full">
       {issueIds && issueIds.length > 0 ? (
         issueIds.map((issueId: string) => {
           if (!issueId) return null;
-
           return (
-            <IssueBlock
+            <RenderIfVisible
-              key={issueId}
+              key={`${issueId}`}
-              issueId={issueId}
+              defaultHeight="3rem"
-              issuesMap={issuesMap}
+              root={containerRef}
-              handleIssues={handleIssues}
+              classNames={"relative border border-transparent border-b-custom-border-200 last:border-b-transparent"}
-              quickActions={quickActions}
+              changingReference={issueIds}
-              canEditProperties={canEditProperties}
+            >
-              displayProperties={displayProperties}
+              <IssueBlock
-            />
+                issueId={issueId}
+                issuesMap={issuesMap}
+                handleIssues={handleIssues}
+                quickActions={quickActions}
+                canEditProperties={canEditProperties}
+                displayProperties={displayProperties}
+              />
+            </RenderIfVisible>
           );
         })
       ) : (

web/components/issues/issue-layouts/list/default.tsx

@@ -1,5 +1,7 @@
+import { useRef } from "react";
 // components
 import { IssueBlocksList, ListQuickAddIssueForm } from "components/issues";
+import { HeaderGroupByCard } from "./headers/group-by-card";
 // hooks
 import { useLabel, useMember, useProject, useProjectState } from "hooks/store";
 // types
@@ -10,12 +12,12 @@ import {
   IIssueDisplayProperties,
   TIssueMap,
   TUnGroupedIssues,
+  IGroupByColumn,
 } from "@plane/types";
 import { EIssueActions } from "../types";
 // constants
-import { HeaderGroupByCard } from "./headers/group-by-card";
-import { getGroupByColumns } from "../utils";
 import { TCreateModalStoreTypes } from "constants/issue";
+import { getGroupByColumns } from "../utils";
 
 export interface IGroupByList {
   issueIds: TGroupedIssues | TUnGroupedIssues | any;
@@ -64,9 +66,11 @@ const GroupByList: React.FC<IGroupByList> = (props) => {
   const label = useLabel();
   const projectState = useProjectState();
 
-  const list = getGroupByColumns(group_by as GroupByColumnTypes, project, label, projectState, member, true);
+  const containerRef = useRef<HTMLDivElement | null>(null);
 
-  if (!list) return null;
+  const groups = getGroupByColumns(group_by as GroupByColumnTypes, project, label, projectState, member, true);
+
+  if (!groups) return null;
 
   const prePopulateQuickAddData = (groupByKey: string | null, value: any) => {
     const defaultState = projectState.projectStates?.find((state) => state.default);
@@ -104,11 +108,11 @@ const GroupByList: React.FC<IGroupByList> = (props) => {
   const isGroupByCreatedBy = group_by === "created_by";
 
   return (
-    <div className="relative h-full w-full">
+    <div ref={containerRef} className="relative overflow-auto h-full w-full">
-      {list &&
+      {groups &&
-        list.length > 0 &&
+        groups.length > 0 &&
-        list.map(
+        groups.map(
-          (_list: any) =>
+          (_list: IGroupByColumn) =>
             validateEmptyIssueGroups(is_list ? issueIds : issueIds?.[_list.id]) && (
               <div key={_list.id} className={`flex flex-shrink-0 flex-col`}>
                 <div className="sticky top-0 z-[2] w-full flex-shrink-0 border-b border-custom-border-200 bg-custom-background-90 px-3 py-1">
@@ -131,6 +135,7 @@ const GroupByList: React.FC<IGroupByList> = (props) => {
                     quickActions={quickActions}
                     displayProperties={displayProperties}
                     canEditProperties={canEditProperties}
+                    containerRef={containerRef}
                   />
                 )}
 

web/components/issues/issue-layouts/spreadsheet/issue-row.tsx

@@ -1,4 +1,4 @@
-import { useRef, useState } from "react";
+import { Dispatch, MutableRefObject, SetStateAction, useRef, useState } from "react";
 import { useRouter } from "next/router";
 import { observer } from "mobx-react-lite";
 // icons
@@ -7,6 +7,7 @@ import { ChevronRight, MoreHorizontal } from "lucide-react";
 import { SPREADSHEET_PROPERTY_LIST } from "constants/spreadsheet";
 // components
 import { WithDisplayPropertiesHOC } from "../properties/with-display-properties-HOC";
+import RenderIfVisible from "components/core/render-if-visible-HOC";
 import { IssueColumn } from "./issue-column";
 // ui
 import { ControlLink, Tooltip } from "@plane/ui";
@@ -32,6 +33,9 @@ interface Props {
   portalElement: React.MutableRefObject<HTMLDivElement | null>;
   nestingLevel: number;
   issueId: string;
+  isScrolled: MutableRefObject<boolean>;
+  containerRef: MutableRefObject<HTMLTableElement | null>;
+  issueIds: string[];
 }
 
 export const SpreadsheetIssueRow = observer((props: Props) => {
@@ -44,8 +48,96 @@ export const SpreadsheetIssueRow = observer((props: Props) => {
     handleIssues,
     quickActions,
     canEditProperties,
+    isScrolled,
+    containerRef,
+    issueIds,
   } = props;
 
+  const [isExpanded, setExpanded] = useState<boolean>(false);
+  const { subIssues: subIssuesStore } = useIssueDetail();
+
+  const subIssues = subIssuesStore.subIssuesByIssueId(issueId);
+
+  return (
+    <>
+      {/* first column/ issue name and key column */}
+      <RenderIfVisible
+        as="tr"
+        defaultHeight="calc(2.75rem - 1px)"
+        root={containerRef}
+        placeholderChildren={<td colSpan={100} className="border-b-[0.5px]" />}
+        changingReference={issueIds}
+      >
+        <IssueRowDetails
+          issueId={issueId}
+          displayProperties={displayProperties}
+          quickActions={quickActions}
+          canEditProperties={canEditProperties}
+          nestingLevel={nestingLevel}
+          isEstimateEnabled={isEstimateEnabled}
+          handleIssues={handleIssues}
+          portalElement={portalElement}
+          isScrolled={isScrolled}
+          isExpanded={isExpanded}
+          setExpanded={setExpanded}
+        />
+      </RenderIfVisible>
+
+      {isExpanded &&
+        subIssues &&
+        subIssues.length > 0 &&
+        subIssues.map((subIssueId: string) => (
+          <SpreadsheetIssueRow
+            key={subIssueId}
+            issueId={subIssueId}
+            displayProperties={displayProperties}
+            quickActions={quickActions}
+            canEditProperties={canEditProperties}
+            nestingLevel={nestingLevel + 1}
+            isEstimateEnabled={isEstimateEnabled}
+            handleIssues={handleIssues}
+            portalElement={portalElement}
+            isScrolled={isScrolled}
+            containerRef={containerRef}
+            issueIds={issueIds}
+          />
+        ))}
+    </>
+  );
+});
+
+interface IssueRowDetailsProps {
+  displayProperties: IIssueDisplayProperties;
+  isEstimateEnabled: boolean;
+  quickActions: (
+    issue: TIssue,
+    customActionButton?: React.ReactElement,
+    portalElement?: HTMLDivElement | null
+  ) => React.ReactNode;
+  canEditProperties: (projectId: string | undefined) => boolean;
+  handleIssues: (issue: TIssue, action: EIssueActions) => Promise<void>;
+  portalElement: React.MutableRefObject<HTMLDivElement | null>;
+  nestingLevel: number;
+  issueId: string;
+  isScrolled: MutableRefObject<boolean>;
+  isExpanded: boolean;
+  setExpanded: Dispatch<SetStateAction<boolean>>;
+}
+
+const IssueRowDetails = observer((props: IssueRowDetailsProps) => {
+  const {
+    displayProperties,
+    issueId,
+    isEstimateEnabled,
+    nestingLevel,
+    portalElement,
+    handleIssues,
+    quickActions,
+    canEditProperties,
+    isScrolled,
+    isExpanded,
+    setExpanded,
+  } = props;
   // router
   const router = useRouter();
   const { workspaceSlug } = router.query;
@@ -54,8 +146,6 @@ export const SpreadsheetIssueRow = observer((props: Props) => {
   const { peekIssue, setPeekIssue } = useIssueDetail();
   // states
   const [isMenuActive, setIsMenuActive] = useState(false);
-  const [isExpanded, setExpanded] = useState<boolean>(false);
-
   const menuActionRef = useRef<HTMLDivElement | null>(null);
 
   const handleIssuePeekOverview = (issue: TIssue) => {
@@ -66,7 +156,6 @@ export const SpreadsheetIssueRow = observer((props: Props) => {
   const { subIssues: subIssuesStore, issue } = useIssueDetail();
 
   const issueDetail = issue.getIssueById(issueId);
-  const subIssues = subIssuesStore.subIssuesByIssueId(issueId);
 
   const paddingLeft = `${nestingLevel * 54}px`;
 
@@ -91,81 +180,77 @@ export const SpreadsheetIssueRow = observer((props: Props) => {
       <MoreHorizontal className="h-3.5 w-3.5" />
     </div>
   );
-
   if (!issueDetail) return null;
 
   const disableUserActions = !canEditProperties(issueDetail.project_id);
 
   return (
     <>
-      <tr
+      <td
-        className={cn({
+        className={cn(
-          "border border-custom-primary-70 hover:border-custom-primary-70": peekIssue?.issueId === issueDetail.id,
+          "sticky group left-0 h-11  w-[28rem] flex items-center bg-custom-background-100 text-sm after:absolute border-r-[0.5px] border-custom-border-200",
-        })}
+          {
+            "border-b-[0.5px]": peekIssue?.issueId !== issueDetail.id,
+          },
+          {
+            "border border-custom-primary-70 hover:border-custom-primary-70": peekIssue?.issueId === issueDetail.id,
+          },
+          {
+            "shadow-[8px_22px_22px_10px_rgba(0,0,0,0.05)]": isScrolled.current,
+          }
+        )}
+        tabIndex={0}
       >
-        {/* first column/ issue name and key column */}
+        <WithDisplayPropertiesHOC displayProperties={displayProperties} displayPropertyKey="key">
-        <td
+          <div
-          className={cn(
+            className="flex min-w-min items-center gap-1.5 px-4 py-2.5 pr-0"
-            "sticky group left-0 h-11  w-[28rem] flex items-center bg-custom-background-100 text-sm after:absolute border-r-[0.5px] border-custom-border-200 focus:border-custom-primary-70",
+            style={issueDetail.parent_id && nestingLevel !== 0 ? { paddingLeft } : {}}
-            {
+          >
-              "border-b-[0.5px]": peekIssue?.issueId !== issueDetail.id,
+            <div className="relative flex cursor-pointer items-center text-center text-xs hover:text-custom-text-100">
-            }
+              <span
-          )}
+                className={`flex items-center justify-center font-medium  group-hover:opacity-0 ${
-          tabIndex={0}
+                  isMenuActive ? "opacity-0" : "opacity-100"
-        >
+                }`}
-          <WithDisplayPropertiesHOC displayProperties={displayProperties} displayPropertyKey="key">
+              >
-            <div
+                {getProjectById(issueDetail.project_id)?.identifier}-{issueDetail.sequence_id}
-              className="flex min-w-min items-center gap-1.5 px-4 py-2.5 pr-0"
+              </span>
-              style={issueDetail.parent_id && nestingLevel !== 0 ? { paddingLeft } : {}}
-            >
-              <div className="relative flex cursor-pointer items-center text-center text-xs hover:text-custom-text-100">
-                <span
-                  className={`flex items-center justify-center font-medium  group-hover:opacity-0 ${
-                    isMenuActive ? "opacity-0" : "opacity-100"
-                  }`}
-                >
-                  {getProjectById(issueDetail.project_id)?.identifier}-{issueDetail.sequence_id}
-                </span>
 
-                {canEditProperties(issueDetail.project_id) && (
+              {canEditProperties(issueDetail.project_id) && (
-                  <div className={`absolute left-2.5 top-0 hidden group-hover:block ${isMenuActive ? "!block" : ""}`}>
+                <div className={`absolute left-2.5 top-0 hidden group-hover:block ${isMenuActive ? "!block" : ""}`}>
-                    {quickActions(issueDetail, customActionButton, portalElement.current)}
+                  {quickActions(issueDetail, customActionButton, portalElement.current)}
-                  </div>
-                )}
-              </div>
-
-              {issueDetail.sub_issues_count > 0 && (
-                <div className="flex h-6 w-6 items-center justify-center">
-                  <button
-                    className="h-5 w-5 cursor-pointer rounded-sm hover:bg-custom-background-90 hover:text-custom-text-100"
-                    onClick={() => handleToggleExpand()}
-                  >
-                    <ChevronRight className={`h-3.5 w-3.5 ${isExpanded ? "rotate-90" : ""}`} />
-                  </button>
                 </div>
               )}
             </div>
-          </WithDisplayPropertiesHOC>
+
-          <ControlLink
+            {issueDetail.sub_issues_count > 0 && (
-            href={`/${workspaceSlug}/projects/${issueDetail.project_id}/issues/${issueId}`}
+              <div className="flex h-6 w-6 items-center justify-center">
-            target="_blank"
+                <button
-            onClick={() => handleIssuePeekOverview(issueDetail)}
+                  className="h-5 w-5 cursor-pointer rounded-sm hover:bg-custom-background-90 hover:text-custom-text-100"
-            className="clickable w-full line-clamp-1 cursor-pointer text-sm text-custom-text-100"
+                  onClick={() => handleToggleExpand()}
-          >
-            <div className="w-full overflow-hidden">
-              <Tooltip tooltipHeading="Title" tooltipContent={issueDetail.name}>
-                <div
-                  className="h-full w-full cursor-pointer truncate px-4 py-2.5 text-left text-[0.825rem] text-custom-text-100"
-                  tabIndex={-1}
                 >
-                  {issueDetail.name}
+                  <ChevronRight className={`h-3.5 w-3.5 ${isExpanded ? "rotate-90" : ""}`} />
-                </div>
+                </button>
-              </Tooltip>
+              </div>
-            </div>
+            )}
-          </ControlLink>
+          </div>
-        </td>
+        </WithDisplayPropertiesHOC>
-        {/* Rest of the columns */}
+        <ControlLink
-        {SPREADSHEET_PROPERTY_LIST.map((property) => (
+          href={`/${workspaceSlug}/projects/${issueDetail.project_id}/issues/${issueId}`}
+          target="_blank"
+          onClick={() => handleIssuePeekOverview(issueDetail)}
+          className="clickable w-full line-clamp-1 cursor-pointer text-sm text-custom-text-100"
+        >
+          <div className="w-full overflow-hidden">
+            <Tooltip tooltipHeading="Title" tooltipContent={issueDetail.name}>
+              <div className="h-full w-full cursor-pointer truncate px-4 py-2.5 text-left text-[0.825rem] text-custom-text-100" tabIndex={-1}>
+                {issueDetail.name}
+              </div>
+            </Tooltip>
+          </div>
+        </ControlLink>
+      </td>
+      {/* Rest of the columns */}
+      {SPREADSHEET_PROPERTY_LIST.map((property) => (
           <IssueColumn
             displayProperties={displayProperties}
             issueDetail={issueDetail}
@@ -175,24 +260,6 @@ export const SpreadsheetIssueRow = observer((props: Props) => {
             isEstimateEnabled={isEstimateEnabled}
           />
         ))}
-      </tr>
-
-      {isExpanded &&
-        subIssues &&
-        subIssues.length > 0 &&
-        subIssues.map((subIssueId: string) => (
-          <SpreadsheetIssueRow
-            key={subIssueId}
-            issueId={subIssueId}
-            displayProperties={displayProperties}
-            quickActions={quickActions}
-            canEditProperties={canEditProperties}
-            nestingLevel={nestingLevel + 1}
-            isEstimateEnabled={isEstimateEnabled}
-            handleIssues={handleIssues}
-            portalElement={portalElement}
-          />
-        ))}
     </>
   );
 });

web/components/issues/issue-layouts/spreadsheet/spreadsheet-table.tsx

@@ -1,4 +1,5 @@
 import { observer } from "mobx-react-lite";
+import { MutableRefObject, useEffect, useRef } from "react";
 //types
 import { IIssueDisplayFilterOptions, IIssueDisplayProperties, TIssue } from "@plane/types";
 import { EIssueActions } from "../types";
@@ -21,6 +22,7 @@ type Props = {
   handleIssues: (issue: TIssue, action: EIssueActions) => Promise<void>;
   canEditProperties: (projectId: string | undefined) => boolean;
   portalElement: React.MutableRefObject<HTMLDivElement | null>;
+  containerRef: MutableRefObject<HTMLTableElement | null>;
 };
 
 export const SpreadsheetTable = observer((props: Props) => {
@@ -34,8 +36,45 @@ export const SpreadsheetTable = observer((props: Props) => {
     quickActions,
     handleIssues,
     canEditProperties,
+    containerRef,
   } = props;
 
+  // states
+  const isScrolled = useRef(false);
+
+  const handleScroll = () => {
+    if (!containerRef.current) return;
+    const scrollLeft = containerRef.current.scrollLeft;
+
+    const columnShadow = "8px 22px 22px 10px rgba(0, 0, 0, 0.05)"; // shadow for regular columns
+    const headerShadow = "8px -22px 22px 10px rgba(0, 0, 0, 0.05)"; // shadow for headers
+
+    //The shadow styles are added this way to avoid re-render of all the rows of table, which could be costly
+    if (scrollLeft > 0 !== isScrolled.current) {
+      const firtColumns = containerRef.current.querySelectorAll("table tr td:first-child, th:first-child");
+
+      for (let i = 0; i < firtColumns.length; i++) {
+        const shadow = i === 0 ? headerShadow : columnShadow;
+        if (scrollLeft > 0) {
+          (firtColumns[i] as HTMLElement).style.boxShadow = shadow;
+        } else {
+          (firtColumns[i] as HTMLElement).style.boxShadow = "none";
+        }
+      }
+      isScrolled.current = scrollLeft > 0;
+    }
+  };
+
+  useEffect(() => {
+    const currentContainerRef = containerRef.current;
+
+    if (currentContainerRef) currentContainerRef.addEventListener("scroll", handleScroll);
+
+    return () => {
+      if (currentContainerRef) currentContainerRef.removeEventListener("scroll", handleScroll);
+    };
+  }, []);
+
   const handleKeyBoardNavigation = useTableKeyboardNavigation();
 
   return (
@@ -58,6 +97,9 @@ export const SpreadsheetTable = observer((props: Props) => {
             isEstimateEnabled={isEstimateEnabled}
             handleIssues={handleIssues}
             portalElement={portalElement}
+            containerRef={containerRef}
+            isScrolled={isScrolled}
+            issueIds={issueIds}
           />
         ))}
       </tbody>

web/components/issues/issue-layouts/spreadsheet/spreadsheet-view.tsx

@@ -1,4 +1,4 @@
-import React, { useEffect, useRef } from "react";
+import React, { useRef } from "react";
 import { observer } from "mobx-react-lite";
 // components
 import { Spinner } from "@plane/ui";
@@ -48,8 +48,6 @@ export const SpreadsheetView: React.FC<Props> = observer((props) => {
     enableQuickCreateIssue,
     disableIssueCreation,
   } = props;
-  // states
-  const isScrolled = useRef(false);
   // refs
   const containerRef = useRef<HTMLTableElement | null>(null);
   const portalRef = useRef<HTMLDivElement | null>(null);
@@ -58,39 +56,6 @@ export const SpreadsheetView: React.FC<Props> = observer((props) => {
 
   const isEstimateEnabled: boolean = currentProjectDetails?.estimate !== null;
 
-  const handleScroll = () => {
-    if (!containerRef.current) return;
-    const scrollLeft = containerRef.current.scrollLeft;
-
-    const columnShadow = "8px 22px 22px 10px rgba(0, 0, 0, 0.05)"; // shadow for regular columns
-    const headerShadow = "8px -22px 22px 10px rgba(0, 0, 0, 0.05)"; // shadow for headers
-
-    //The shadow styles are added this way to avoid re-render of all the rows of table, which could be costly
-    if (scrollLeft > 0 !== isScrolled.current) {
-      const firtColumns = containerRef.current.querySelectorAll("table tr td:first-child, th:first-child");
-
-      for (let i = 0; i < firtColumns.length; i++) {
-        const shadow = i === 0 ? headerShadow : columnShadow;
-        if (scrollLeft > 0) {
-          (firtColumns[i] as HTMLElement).style.boxShadow = shadow;
-        } else {
-          (firtColumns[i] as HTMLElement).style.boxShadow = "none";
-        }
-      }
-      isScrolled.current = scrollLeft > 0;
-    }
-  };
-
-  useEffect(() => {
-    const currentContainerRef = containerRef.current;
-
-    if (currentContainerRef) currentContainerRef.addEventListener("scroll", handleScroll);
-
-    return () => {
-      if (currentContainerRef) currentContainerRef.removeEventListener("scroll", handleScroll);
-    };
-  }, []);
-
   if (!issueIds || issueIds.length === 0)
     return (
       <div className="grid h-full w-full place-items-center">
@@ -112,6 +77,7 @@ export const SpreadsheetView: React.FC<Props> = observer((props) => {
           quickActions={quickActions}
           handleIssues={handleIssues}
           canEditProperties={canEditProperties}
+          containerRef={containerRef}
         />
       </div>
       <div className="border-t border-custom-border-100">

web/components/issues/issue-layouts/utils.tsx

@@ -1,10 +1,10 @@
 import { Avatar, PriorityIcon, StateGroupIcon } from "@plane/ui";
-import { ISSUE_PRIORITIES } from "constants/issue";
+import { EIssueListRow, ISSUE_PRIORITIES } from "constants/issue";
 import { renderEmoji } from "helpers/emoji.helper";
 import { IMemberRootStore } from "store/member";
 import { IProjectStore } from "store/project/project.store";
 import { IStateStore } from "store/state.store";
-import { GroupByColumnTypes, IGroupByColumn } from "@plane/types";
+import { GroupByColumnTypes, IGroupByColumn, IIssueListRow, TGroupedIssues, TUnGroupedIssues } from "@plane/types";
 import { STATE_GROUPS } from "constants/state";
 import { ILabelStore } from "store/label.store";
 

web/constants/issue.ts

@@ -412,6 +412,13 @@ export const ISSUE_DISPLAY_FILTERS_BY_LAYOUT: {
   },
 };
 
+export enum EIssueListRow {
+  HEADER = "HEADER",
+  ISSUE = "ISSUE",
+  NO_ISSUES = "NO_ISSUES",
+  QUICK_ADD = "QUICK_ADD",
+}
+
 export const getValueFromObject = (object: Object, key: string): string | number | boolean | null => {
   const keys = key ? key.split(".") : [];
 
@@ -442,4 +449,4 @@ export const groupReactionEmojis = (reactions: any) => {
   }
 
   return _groupedEmojis;
-};
+};