fix: restore editor focus after hiding project view

Author: lukisch

tests/test_ui_ux_accessibility.py

@@ -4,6 +4,7 @@
 
 import pytest
 from PySide6.QtWidgets import QApplication
+from unittest.mock import patch
 
 from ui.main_window import MainWindow
 from ui.settings_dialog import SettingsDialog
@@ -68,6 +69,27 @@ def test_main_window_toolbar_ux_and_a11y(qapp):
         window.close()
 
 
+def test_hiding_project_view_restores_editor_focus(qapp):
+    """Der Fokus darf nicht im ausgeblendeten Projektbaum verbleiben."""
+    with patch("features.terminal.TerminalWidget._start_shell", lambda self: None):
+        window = MainWindow()
+        try:
+            window.show()
+            qapp.processEvents()
+            editor = window.tab_widget.current_tab().editor
+            window.project_view.tree.setFocus()
+            qapp.processEvents()
+            assert window.project_view.tree.hasFocus()
+
+            window._toggle_project_view()
+            qapp.processEvents()
+
+            assert not window.project_view.isVisible()
+            assert editor.hasFocus()
+        finally:
+            window.close()
+
+
 def test_tab_widget_ux_tooltips_and_a11y(qapp, tmp_path):
     """Prüft Tab-Tooltips mit echtem Pfad und Accessible-Attribute."""
     tabs = TabWidget()

ui/main_window.py

@@ -737,7 +737,16 @@ def _open_file_from_project(self, file_path):
 
     def _toggle_project_view(self):
         """Blendet den Projektbaum ein/aus."""
-        self.project_view.setVisible(not self.project_view.isVisible())
+        was_visible = self.project_view.isVisible()
+        self.project_view.setVisible(not was_visible)
+        if was_visible:
+            self._focus_active_editor()
+
+    def _focus_active_editor(self):
+        """Setzt den Tastaturfokus auf den aktiven Editor zurück."""
+        tab = self.tab_widget.current_tab()
+        if tab and tab.editor:
+            tab.editor.setFocus()
 
     def _toggle_terminal(self):
         """Blendet das untere Panel ein/aus und wechselt zum Terminal-Tab."""