fix(editor): keep composition-owned Escape inside Find (#34969)

Co-authored-by: OrcaWin <293788423+OrcaWin@users.noreply.github.com>

src/renderer/src/components/editor/useRichMarkdownSearch.adversarial.test.tsx

@@ -91,6 +91,43 @@ afterEach(() => {
 })
 
 describe('rich Markdown search adversarial interactions', () => {
+  it.each([{ isComposing: true }, { keyCode: 229 }])(
+    'keeps Find open when Escape belongs to the IME (%o)',
+    (init) => {
+      const { hook, input, query } = mountSearch()
+      query('beta')
+      const event = new KeyboardEvent('keydown', {
+        key: 'Escape',
+        bubbles: true,
+        cancelable: true,
+        ...init
+      })
+
+      act(() => input.dispatchEvent(event))
+
+      expect(hook.result.current.searchState.isSearchOpen).toBe(true)
+      expect(hook.result.current.searchState.searchQuery).toBe('beta')
+      expect(document.activeElement).toBe(input)
+      expect(event.defaultPrevented).toBe(false)
+    }
+  )
+
+  it('still closes Find and returns to the editor on plain Escape', () => {
+    const { hook, editor, input } = mountSearch()
+    const event = new KeyboardEvent('keydown', {
+      key: 'Escape',
+      bubbles: true,
+      cancelable: true
+    })
+
+    act(() => input.dispatchEvent(event))
+    act(() => vi.runOnlyPendingTimers())
+
+    expect(hook.result.current.searchState.isSearchOpen).toBe(false)
+    expect(document.activeElement).toBe(editor.view.dom)
+    expect(event.defaultPrevented).toBe(true)
+  })
+
   it('does not revive a delayed search after a document click and another control focus', () => {
     const { editor, hook, otherControl, query, documentCaret, scrollTo } = mountSearch()
     query('beta')

src/renderer/src/components/editor/useRichMarkdownSearch.ts

@@ -15,6 +15,7 @@ import {
 import { createRichMarkdownSearchMatchesCache } from './rich-markdown-search-matches-cache'
 import { useRichMarkdownSearchHighlights } from './useRichMarkdownSearchHighlights'
 import { addAppKeyListener, removeAppKeyListener } from '@/lib/app-keyboard-router'
+import { isImeOwnedKeyboardEvent } from '@/lib/ime-composition-keyboard-event'
 
 export function useRichMarkdownSearch({
   editor,
@@ -269,7 +270,7 @@ export function useRichMarkdownSearch({
   useEffect(() => {
     const handleKeyDown = (event: KeyboardEvent): void => {
       const root = rootRef.current
-      if (!root) {
+      if (!root || isImeOwnedKeyboardEvent(event)) {
         return
       }