Improve performance of imported file scan

editor/filesystem_dock.cpp

@@ -2890,12 +2890,19 @@ void FileSystemDock::_file_list_gui_input(Ref<InputEvent> p_event) {
 	}
 }
 
-void FileSystemDock::_get_imported_files(const String &p_path, Vector<String> &r_files) const {
+bool FileSystemDock::_get_imported_files(const String &p_path, String &r_extension, Vector<String> &r_files) const {
 	if (!p_path.ends_with("/")) {
 		if (FileAccess::exists(p_path + ".import")) {
+			if (r_extension.is_empty()) {
+				r_extension = p_path.get_extension();
+			} else if (r_extension != p_path.get_extension()) {
+				r_files.clear();
+				return false; // File type mismatch, stop search.
+			}
+
 			r_files.push_back(p_path);
 		}
-		return;
+		return true;
 	}
 
 	Ref<DirAccess> da = DirAccess::open(p_path);
@@ -2904,11 +2911,14 @@ void FileSystemDock::_get_imported_files(const String &p_path, Vector<String> &r
 	while (!n.is_empty()) {
 		if (n != "." && n != ".." && !n.ends_with(".import")) {
 			String npath = p_path + n + (da->current_is_dir() ? "/" : "");
-			_get_imported_files(npath, r_files);
+			if (!_get_imported_files(npath, r_extension, r_files)) {
+				return false;
+			}
 		}
 		n = da->get_next();
 	}
 	da->list_dir_end();
+	return true;
 }
 
 void FileSystemDock::_update_import_dock() {
@@ -2933,10 +2943,16 @@ void FileSystemDock::_update_import_dock() {
 		}
 	}
 
-	// Expand directory selection
+	if (!selected.is_empty() && selected[0] == "res://") {
+		// Scanning res:// is costly and unlikely to yield any useful results.
+		return;
+	}
+
+	// Expand directory selection.
 	Vector<String> efiles;
-	for (int i = 0; i < selected.size(); i++) {
-		_get_imported_files(selected[i], efiles);
+	String extension;
+	for (const String &fpath : selected) {
+		_get_imported_files(fpath, extension, efiles);
 	}
 
 	// Check import.

editor/filesystem_dock.h

@@ -213,7 +213,7 @@ private:
 	void _file_multi_selected(int p_index, bool p_selected);
 	void _tree_multi_selected(Object *p_item, int p_column, bool p_selected);
 
-	void _get_imported_files(const String &p_path, Vector<String> &r_files) const;
+	bool _get_imported_files(const String &p_path, String &r_extension, Vector<String> &r_files) const;
 	void _update_import_dock();
 
 	void _get_all_items_in_dir(EditorFileSystemDirectory *p_efsd, Vector<String> &r_files, Vector<String> &r_folders) const;