perf(editor): honor the Find query debounce (#34829)

* perf(editor): honor the Find query debounce

* test(editor): drop redundant Find debounce walk-count test

---------

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

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

@@ -86,9 +86,10 @@ describe('live rich markdown search reuse', () => {
     const { hook } = mountSearch()
     act(() => hook.result.current.openSearch())
     act(() => hook.result.current.searchActions.setSearchQuery('beta'))
-    expect(walk).toHaveBeenCalledTimes(1)
+    expect(walk).not.toHaveBeenCalled()
     act(() => vi.advanceTimersByTime(150))
     expect(hook.result.current.searchState.matchCount).toBe(2)
+    expect(walk).toHaveBeenCalledTimes(1)
     for (let index = 0; index < 20; index++) {
       act(() => hook.result.current.searchActions.setReplaceQuery(`replacement ${index}`))
       act(() => hook.result.current.searchActions.moveToMatch(1))
@@ -97,6 +98,8 @@ describe('live rich markdown search reuse', () => {
     act(() => hook.result.current.searchActions.closeSearch())
     act(() => hook.result.current.openSearch())
     act(() => hook.result.current.searchActions.setSearchQuery('beta'))
+    expect(walk).toHaveBeenCalledTimes(1)
+    act(() => vi.advanceTimersByTime(150))
     expect(walk).toHaveBeenCalledTimes(2)
     hook.unmount()
   })
@@ -109,6 +112,7 @@ describe('live rich markdown search reuse', () => {
     act(() => vi.advanceTimersByTime(150))
     act(() => hook.result.current.searchActions.setSearchQuery('locked'))
     expect(hook.result.current.searchState.matchCount).toBe(2)
+    act(() => hook.result.current.searchActions.toggleReplaceMode())
     expect(hook.result.current.searchState.replaceDisabled).toBe(true)
     const doc = editor.state.doc
     act(() => hook.result.current.searchActions.replaceAllMatches())

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

@@ -89,8 +89,9 @@ export function useRichMarkdownSearch({
     })
   }, [editor, findMatches, isSearchOpen, matchCase, searchQuery, wholeWord])
 
-  // Derive disabled state from the same live atom guards as replacement, including during the highlight debounce.
-  const replaceDisabled = getLiveMatches().some((match) => match.touchesReadOnlyAtom)
+  // Hidden replace controls must not bypass the find debounce with a live scan.
+  const replaceDisabled =
+    isReplaceMode && getLiveMatches().some((match) => match.touchesReadOnlyAtom)
 
   const activeMatchIndex =
     !isSearchOpen || matchCount === 0