fix(textarea): stabilize inline interaction overlays

src/renderer/components/ui/ChipInteractionLayer.tsx

@@ -171,6 +171,34 @@ interface ChipInteractionLayerProps {
   onRemove: (chipId: string) => void;
 }
 
+function areChipsEquivalent(a: InlineChip, b: InlineChip): boolean {
+  return (
+    a.id === b.id &&
+    a.filePath === b.filePath &&
+    a.fileName === b.fileName &&
+    a.fromLine === b.fromLine &&
+    a.toLine === b.toLine &&
+    a.codeText === b.codeText &&
+    a.displayPath === b.displayPath &&
+    a.isFolder === b.isFolder
+  );
+}
+
+function areChipPositionsEquivalent(current: ChipPosition[], next: ChipPosition[]): boolean {
+  if (current.length !== next.length) return false;
+
+  return current.every((position, index) => {
+    const nextPosition = next[index];
+    return (
+      position.top === nextPosition.top &&
+      position.left === nextPosition.left &&
+      position.width === nextPosition.width &&
+      position.height === nextPosition.height &&
+      areChipsEquivalent(position.chip, nextPosition.chip)
+    );
+  });
+}
+
 export const ChipInteractionLayer = ({
   chips,
   value,
@@ -179,18 +207,25 @@ export const ChipInteractionLayer = ({
   onRemove,
 }: ChipInteractionLayerProps): React.JSX.Element | null => {
   const [positions, setPositions] = React.useState<ChipPosition[]>([]);
+  const positionsRef = React.useRef<ChipPosition[]>([]);
   const revealFileInEditor = useStore((s) => s.revealFileInEditor);
   const revealFolderInEditor = useStore((s) => s.revealFolderInEditor);
 
+  const commitPositions = React.useCallback((nextPositions: ChipPosition[]) => {
+    if (areChipPositionsEquivalent(positionsRef.current, nextPositions)) return;
+    positionsRef.current = nextPositions;
+    setPositions(nextPositions);
+  }, []);
+
   React.useLayoutEffect(() => {
     if (chips.length === 0) {
-      setPositions([]);
+      commitPositions([]);
       return;
     }
     const textarea = textareaRef.current;
     if (!textarea) return;
-    setPositions(calculateChipPositions(textarea, value, chips));
-  }, [chips, value, textareaRef]);
+    commitPositions(calculateChipPositions(textarea, value, chips));
+  }, [chips, commitPositions, value, textareaRef]);
 
   if (positions.length === 0) return null;
 
@@ -200,6 +235,14 @@ export const ChipInteractionLayer = ({
         {positions.map((pos) => {
           const isFileChip = pos.chip.fromLine == null;
           const isFolderChip = pos.chip.isFolder === true;
+          const openChipTarget = (): void => {
+            if (isFolderChip) {
+              revealFolderInEditor(pos.chip.filePath);
+            } else {
+              revealFileInEditor(pos.chip.filePath);
+            }
+          };
+
           return (
             <Tooltip key={pos.chip.id}>
               <TooltipTrigger asChild>
@@ -211,20 +254,19 @@ export const ChipInteractionLayer = ({
                     width: pos.width,
                     height: pos.height,
                   }}
-                  onClick={
-                    isFileChip
-                      ? (e) => {
-                          e.preventDefault();
-                          e.stopPropagation();
-                          if (isFolderChip) {
-                            revealFolderInEditor(pos.chip.filePath);
-                          } else {
-                            revealFileInEditor(pos.chip.filePath);
-                          }
-                        }
-                      : undefined
-                  }
                 >
+                  {isFileChip ? (
+                    <button
+                      type="button"
+                      className="absolute inset-0 cursor-pointer rounded-sm bg-transparent p-0"
+                      onClick={(e) => {
+                        e.preventDefault();
+                        e.stopPropagation();
+                        openChipTarget();
+                      }}
+                      aria-label={`Open ${chipDisplayLabel(pos.chip)}`}
+                    />
+                  ) : null}
                   <button
                     type="button"
                     className="pointer-events-none absolute -right-1 -top-1.5 z-30 flex size-3.5 items-center justify-center rounded-full border border-[var(--color-border-emphasis)] bg-[var(--color-surface-raised)] opacity-0 transition-opacity group-hover:pointer-events-auto group-hover:opacity-100"

src/renderer/components/ui/MentionInteractionLayer.test.tsx

@@ -0,0 +1,82 @@
+import React, { act, Profiler } from 'react';
+import { createRoot } from 'react-dom/client';
+
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+
+import { MentionInteractionLayer } from './MentionInteractionLayer';
+
+import type { MentionSuggestion } from '@renderer/types/mention';
+
+vi.mock('@renderer/hooks/useTheme', () => ({
+  useTheme: () => ({
+    theme: 'light',
+    resolvedTheme: 'light',
+    isDark: false,
+    isLight: true,
+  }),
+}));
+
+const flushMicrotasks = async (): Promise<void> => {
+  await Promise.resolve();
+  await Promise.resolve();
+};
+
+const suggestion: MentionSuggestion = {
+  id: 'member:alice',
+  name: 'Alice',
+  subtitle: 'Engineer',
+  type: 'member',
+};
+
+describe('MentionInteractionLayer', () => {
+  beforeEach(() => {
+    vi.stubGlobal('IS_REACT_ACT_ENVIRONMENT', true);
+  });
+
+  afterEach(() => {
+    document.body.innerHTML = '';
+    vi.unstubAllGlobals();
+  });
+
+  it('does not schedule a nested update when suggestions exist but text has no mentions', async () => {
+    const host = document.createElement('div');
+    document.body.appendChild(host);
+    const root = createRoot(host);
+    const renderPhases: string[] = [];
+
+    const Harness = (): React.JSX.Element => {
+      const textareaRef = React.useRef<HTMLTextAreaElement | null>(null);
+
+      return (
+        <>
+          <textarea ref={textareaRef} defaultValue="" />
+          <Profiler
+            id="mention-interaction-layer"
+            onRender={(_id, phase) => {
+              renderPhases.push(phase);
+            }}
+          >
+            <MentionInteractionLayer
+              suggestions={[suggestion]}
+              value=""
+              textareaRef={textareaRef}
+              scrollTop={0}
+            />
+          </Profiler>
+        </>
+      );
+    };
+
+    await act(async () => {
+      root.render(<Harness />);
+      await flushMicrotasks();
+    });
+
+    expect(renderPhases).toEqual(['mount']);
+
+    await act(async () => {
+      root.unmount();
+      await flushMicrotasks();
+    });
+  });
+});

src/renderer/components/ui/MentionInteractionLayer.tsx

@@ -29,6 +29,36 @@ interface MentionInteractionLayerProps {
   scrollTop: number;
 }
 
+function areSuggestionsEquivalent(a: MentionSuggestion, b: MentionSuggestion): boolean {
+  return (
+    a.id === b.id &&
+    a.name === b.name &&
+    a.subtitle === b.subtitle &&
+    a.color === b.color &&
+    a.type === b.type &&
+    a.isOnline === b.isOnline &&
+    a.insertText === b.insertText
+  );
+}
+
+function areMentionPositionsEquivalent(
+  current: MentionPosition[],
+  next: MentionPosition[]
+): boolean {
+  if (current.length !== next.length) return false;
+
+  return current.every((position, index) => {
+    const nextPosition = next[index];
+    return (
+      position.top === nextPosition.top &&
+      position.left === nextPosition.left &&
+      position.width === nextPosition.width &&
+      position.height === nextPosition.height &&
+      areSuggestionsEquivalent(position.suggestion, nextPosition.suggestion)
+    );
+  });
+}
+
 export const MentionInteractionLayer = ({
   suggestions,
   value,
@@ -36,20 +66,27 @@ export const MentionInteractionLayer = ({
   scrollTop,
 }: MentionInteractionLayerProps): React.JSX.Element | null => {
   const [positions, setPositions] = React.useState<MentionPosition[]>([]);
+  const positionsRef = React.useRef<MentionPosition[]>([]);
   const { isLight } = useTheme();
 
+  const commitPositions = React.useCallback((nextPositions: MentionPosition[]) => {
+    if (areMentionPositionsEquivalent(positionsRef.current, nextPositions)) return;
+    positionsRef.current = nextPositions;
+    setPositions(nextPositions);
+  }, []);
+
   React.useLayoutEffect(() => {
     const filtered = suggestions.filter(
       (s) => s.type !== 'task' && s.type !== 'file' && s.type !== 'folder'
     );
     if (filtered.length === 0) {
-      setPositions([]);
+      commitPositions([]);
       return;
     }
     const textarea = textareaRef.current;
     if (!textarea) return;
-    setPositions(calculateMentionPositions(textarea, value, filtered));
-  }, [suggestions, value, textareaRef]);
+    commitPositions(calculateMentionPositions(textarea, value, filtered));
+  }, [commitPositions, suggestions, value, textareaRef]);
 
   if (positions.length === 0) return null;
 

src/renderer/components/ui/MentionableTextarea.tsx

@@ -701,16 +701,6 @@ export const MentionableTextarea = React.forwardRef<HTMLTextAreaElement, Mention
       return () => resizeObserver.disconnect();
     }, [surfaceDecoration]);
 
-    // --- Overlay activation ---
-    const hasOverlay =
-      value.includes('http://') ||
-      value.includes('https://') ||
-      parseStandaloneSlashCommand(value) !== null ||
-      suggestions.length > 0 ||
-      teamSuggestions.length > 0 ||
-      taskSuggestions.length > 0 ||
-      chips.length > 0;
-
     // Combine member + team suggestions for overlay parsing
     const mentionOverlaySuggestions = React.useMemo(
       () => (teamSuggestions.length > 0 ? [...suggestions, ...teamSuggestions] : suggestions),
@@ -721,6 +711,17 @@ export const MentionableTextarea = React.forwardRef<HTMLTextAreaElement, Mention
       () => (slashCommand ? getKnownSlashCommand(slashCommand.name) : null),
       [slashCommand]
     );
+    const hasUrlOverlay = value.includes('http://') || value.includes('https://');
+    const hasMentionOverlay = mentionOverlaySuggestions.length > 0 && value.includes('@');
+    const hasTaskOverlay = taskSuggestions.length > 0 && value.includes('#');
+
+    // --- Overlay activation ---
+    const hasOverlay =
+      hasUrlOverlay ||
+      slashCommand !== null ||
+      hasMentionOverlay ||
+      hasTaskOverlay ||
+      chips.length > 0;
 
     const segments = React.useMemo(
       () =>
@@ -951,7 +952,6 @@ export const MentionableTextarea = React.forwardRef<HTMLTextAreaElement, Mention
         handleChipKeyDown,
         mentionHandleKeyDown,
         isOpen,
-        effectiveSuggestions.length,
         effectiveSuggestions,
         handleActiveSelect,
         dismiss,
@@ -1289,7 +1289,7 @@ export const MentionableTextarea = React.forwardRef<HTMLTextAreaElement, Mention
             </div>
           ) : null}
 
-          {taskSuggestions.length > 0 ? (
+          {hasTaskOverlay ? (
             <TaskReferenceInteractionLayer
               taskSuggestions={taskSuggestions}
               value={value}
@@ -1298,7 +1298,7 @@ export const MentionableTextarea = React.forwardRef<HTMLTextAreaElement, Mention
             />
           ) : null}
 
-          {value.includes('http://') || value.includes('https://') ? (
+          {hasUrlOverlay ? (
             <UrlInteractionLayer
               value={value}
               textareaRef={internalRef}
@@ -1313,7 +1313,7 @@ export const MentionableTextarea = React.forwardRef<HTMLTextAreaElement, Mention
             />
           ) : null}
 
-          {mentionOverlaySuggestions.length > 0 ? (
+          {hasMentionOverlay ? (
             <MentionInteractionLayer
               suggestions={mentionOverlaySuggestions}
               value={value}

src/renderer/components/ui/SlashCommandInteractionLayer.tsx

@@ -16,6 +16,27 @@ interface SlashCommandInteractionLayerProps {
   scrollTop: number;
 }
 
+interface SlashCommandPosition {
+  top: number;
+  left: number;
+  width: number;
+  height: number;
+}
+
+function areSlashCommandPositionsEquivalent(
+  current: SlashCommandPosition | null,
+  next: SlashCommandPosition | null
+): boolean {
+  if (current === next) return true;
+  if (!current || !next) return false;
+  return (
+    current.top === next.top &&
+    current.left === next.left &&
+    current.width === next.width &&
+    current.height === next.height
+  );
+}
+
 export const SlashCommandInteractionLayer = ({
   command,
   definition,
@@ -23,12 +44,14 @@ export const SlashCommandInteractionLayer = ({
   textareaRef,
   scrollTop,
 }: SlashCommandInteractionLayerProps): React.JSX.Element | null => {
-  const [position, setPosition] = React.useState<{
-    top: number;
-    left: number;
-    width: number;
-    height: number;
-  } | null>(null);
+  const [position, setPosition] = React.useState<SlashCommandPosition | null>(null);
+  const positionRef = React.useRef<SlashCommandPosition | null>(null);
+
+  const commitPosition = React.useCallback((nextPosition: SlashCommandPosition | null) => {
+    if (areSlashCommandPositionsEquivalent(positionRef.current, nextPosition)) return;
+    positionRef.current = nextPosition;
+    setPosition(nextPosition);
+  }, []);
 
   React.useLayoutEffect(() => {
     const textarea = textareaRef.current;
@@ -44,17 +67,17 @@ export const SlashCommandInteractionLayer = ({
     ]);
 
     if (!match) {
-      setPosition(null);
+      commitPosition(null);
       return;
     }
 
-    setPosition({
+    commitPosition({
       top: match.top,
       left: match.left,
       width: match.width,
       height: match.height,
     });
-  }, [command, textareaRef, value]);
+  }, [command, commitPosition, textareaRef, value]);
 
   if (!definition || !position) return null;
 

src/renderer/components/ui/TaskReferenceInteractionLayer.tsx

@@ -17,6 +17,39 @@ interface TaskReferenceInteractionLayerProps {
 
 type PositionedTaskReference = InlineMatchPosition<MentionSuggestion>;
 
+function areTaskSuggestionsEquivalent(a: MentionSuggestion, b: MentionSuggestion): boolean {
+  return (
+    a.id === b.id &&
+    a.name === b.name &&
+    a.taskId === b.taskId &&
+    a.teamName === b.teamName &&
+    a.teamDisplayName === b.teamDisplayName &&
+    a.ownerName === b.ownerName &&
+    a.ownerColor === b.ownerColor
+  );
+}
+
+function areTaskReferencePositionsEquivalent(
+  current: PositionedTaskReference[],
+  next: PositionedTaskReference[]
+): boolean {
+  if (current.length !== next.length) return false;
+
+  return current.every((position, index) => {
+    const nextPosition = next[index];
+    return (
+      position.start === nextPosition.start &&
+      position.end === nextPosition.end &&
+      position.token === nextPosition.token &&
+      position.top === nextPosition.top &&
+      position.left === nextPosition.left &&
+      position.width === nextPosition.width &&
+      position.height === nextPosition.height &&
+      areTaskSuggestionsEquivalent(position.item, nextPosition.item)
+    );
+  });
+}
+
 export const TaskReferenceInteractionLayer = ({
   taskSuggestions,
   value,
@@ -24,11 +57,18 @@ export const TaskReferenceInteractionLayer = ({
   scrollTop,
 }: TaskReferenceInteractionLayerProps): React.JSX.Element | null => {
   const [positions, setPositions] = React.useState<PositionedTaskReference[]>([]);
+  const positionsRef = React.useRef<PositionedTaskReference[]>([]);
   const openGlobalTaskDetail = useStore((s) => s.openGlobalTaskDetail);
 
+  const commitPositions = React.useCallback((nextPositions: PositionedTaskReference[]) => {
+    if (areTaskReferencePositionsEquivalent(positionsRef.current, nextPositions)) return;
+    positionsRef.current = nextPositions;
+    setPositions(nextPositions);
+  }, []);
+
   React.useLayoutEffect(() => {
     if (taskSuggestions.length === 0 || !value.includes('#')) {
-      setPositions([]);
+      commitPositions([]);
       return;
     }
 
@@ -42,8 +82,8 @@ export const TaskReferenceInteractionLayer = ({
       token: match.raw,
     }));
 
-    setPositions(calculateInlineMatchPositions(textarea, value, matches));
-  }, [taskSuggestions, textareaRef, value]);
+    commitPositions(calculateInlineMatchPositions(textarea, value, matches));
+  }, [commitPositions, taskSuggestions, textareaRef, value]);
 
   if (positions.length === 0) return null;
 

src/renderer/components/ui/UrlInteractionLayer.tsx

@@ -17,6 +17,29 @@ interface UrlInteractionLayerProps {
 
 type PositionedUrlReference = InlineMatchPosition<TextMatch>;
 
+function areUrlPositionsEquivalent(
+  current: PositionedUrlReference[],
+  next: PositionedUrlReference[]
+): boolean {
+  if (current.length !== next.length) return false;
+
+  return current.every((position, index) => {
+    const nextPosition = next[index];
+    return (
+      position.start === nextPosition.start &&
+      position.end === nextPosition.end &&
+      position.token === nextPosition.token &&
+      position.top === nextPosition.top &&
+      position.left === nextPosition.left &&
+      position.width === nextPosition.width &&
+      position.height === nextPosition.height &&
+      position.item.start === nextPosition.item.start &&
+      position.item.end === nextPosition.item.end &&
+      position.item.value === nextPosition.item.value
+    );
+  });
+}
+
 export const UrlInteractionLayer = ({
   value,
   textareaRef,
@@ -24,10 +47,17 @@ export const UrlInteractionLayer = ({
   onRemove,
 }: UrlInteractionLayerProps): React.JSX.Element | null => {
   const [positions, setPositions] = React.useState<PositionedUrlReference[]>([]);
+  const positionsRef = React.useRef<PositionedUrlReference[]>([]);
+
+  const commitPositions = React.useCallback((nextPositions: PositionedUrlReference[]) => {
+    if (areUrlPositionsEquivalent(positionsRef.current, nextPositions)) return;
+    positionsRef.current = nextPositions;
+    setPositions(nextPositions);
+  }, []);
 
   React.useLayoutEffect(() => {
     if (!value.includes('http://') && !value.includes('https://')) {
-      setPositions([]);
+      commitPositions([]);
       return;
     }
 
@@ -41,8 +71,8 @@ export const UrlInteractionLayer = ({
       token: match.value,
     }));
 
-    setPositions(calculateInlineMatchPositions(textarea, value, matches));
-  }, [textareaRef, value]);
+    commitPositions(calculateInlineMatchPositions(textarea, value, matches));
+  }, [commitPositions, textareaRef, value]);
 
   if (positions.length === 0) return null;