Merge pull request microsoft#146213 from microsoft/rebornix/update-replace-all-nb

fix microsoft#142756 update replace all button after input is updated

Author: rebornix

src/vs/workbench/contrib/notebook/browser/contrib/find/findController.ts

@@ -88,7 +88,7 @@ export class NotebookFindWidget extends SimpleFindReplaceWidget implements INote
 			}
 
 			const matches = this._findModel.findMatches;
-			this._replaceAllBtn.setEnabled(matches.find(match => match.modelMatchCount < match.matches.length) === null);
+			this._replaceAllBtn.setEnabled(matches.length > 0 && matches.find(match => match.modelMatchCount < match.matches.length) === undefined);
 
 			if (e.filters) {
 				this._findInput.updateFilterState((this._state.filters?.markupPreview ?? false) || (this._state.filters?.codeOutput ?? false));