fix: stop stale file focus requests from stealing context panel selection

packages/ui/src/components/views/FilesView.tsx

@@ -2762,32 +2762,30 @@ export const FilesView: React.FC<FilesViewProps> = ({ mode = 'full' }) => {
     }
 
     if (selectedFile?.path !== targetPath) {
-      if (confirmDiscardOpen) {
-        return;
-      }
-      void handleSelectFile(toFileNode(targetPath));
+      // Selection is owned by the tab sync / user. A pending focus request must
+      // not steal selection back (e.g. after the user switched to another tab
+      // while this file was still loading). Wait; clear once it loads or the
+      // request is superseded.
       return;
     }
 
-    if (fileLoading || loadedFilePath !== targetPath || fileError || isSelectedImage || isSelectedPdf) {
+    if (fileLoading || loadedFilePath !== targetPath) {
       return;
     }
 
-    if (canEdit && textViewMode === 'edit') {
-      const view = editorViewRef.current;
-      if (!view) {
-        return;
-      }
-      view.focus();
+    // Best-effort focus: preview renderers (markdown/html preview, drawio,
+    // JSON tree, images, PDFs) never mount a CodeMirror editor, so the request
+    // must clear regardless — otherwise it lingers and replays on every
+    // dependency change.
+    if (!fileError && !isSelectedImage && !isSelectedPdf && canEdit && textViewMode === 'edit') {
+      editorViewRef.current?.focus();
     }
 
     setPendingFileFocusPath(null);
   }, [
     canEdit,
-    confirmDiscardOpen,
     fileError,
     fileLoading,
-    handleSelectFile,
     isSelectedImage,
     isSelectedPdf,
     loadedFilePath,
@@ -2796,7 +2794,6 @@ export const FilesView: React.FC<FilesViewProps> = ({ mode = 'full' }) => {
     selectedFile?.path,
     setPendingFileFocusPath,
     textViewMode,
-    toFileNode,
   ]);
 
   const nudgeEditorSelectionAboveKeyboard = React.useCallback((view: EditorView | null) => {