Only focus qutebrowser again after editing finished

See #3431, #3432

qutebrowser/browser/commands.py

@@ -1619,6 +1619,8 @@ class CommandDispatcher:
         ed = editor.ExternalEditor(watch=True, parent=self._tabbed_browser)
         ed.file_updated.connect(functools.partial(
             self.on_file_updated, elem))
+        ed.editing_finished.connect(lambda: mainwindow.raise_window(
+            objreg.last_focused_window(), alert=False))
         ed.edit(text, caret_position)
 
     @cmdutils.register(instance='command-dispatcher', scope='window')
@@ -1647,8 +1649,6 @@ class CommandDispatcher:
         except webelem.Error as e:
             raise cmdexc.CommandError(str(e))
 
-        mainwindow.raise_window(objreg.last_focused_window(), alert=False)
-
     @cmdutils.register(instance='command-dispatcher', maxsplit=0,
                        scope='window')
     def insert_text(self, text):

qutebrowser/misc/editor.py

@@ -42,9 +42,15 @@ class ExternalEditor(QObject):
         _proc: The GUIProcess of the editor.
         _watcher: A QFileSystemWatcher to watch the edited file for changes.
                   Only set if watch=True.
+
+    Signals:
+        file_updated: The text in the edited file was updated.
+                      arg: The new text.
+        editing_finished: The editor process was closed.
     """
 
     file_updated = pyqtSignal(str)
+    editing_finished = pyqtSignal()
 
     def __init__(self, parent=None, watch=False):
         super().__init__(parent)
@@ -84,6 +90,7 @@ class ExternalEditor(QObject):
             return
         # do a final read to make sure we don't miss the last signal
         self._on_file_changed(self._filename)
+        self.editing_finished.emit()
         self._cleanup()
 
     @pyqtSlot(QProcess.ProcessError)