Add some logging about keyboard focus.

This should help with debugging #218 if it occurs again.

qutebrowser/keyinput/modeman.py

@@ -220,9 +220,11 @@ class ModeManager(QObject):
         if curmode != usertypes.KeyMode.insert:
             log.modes.debug("handled: {}, forward-unbound-keys: {}, "
                             "passthrough: {}, is_non_alnum: {} --> filter: "
-                            "{}".format(handled, self._forward_unbound_keys,
-                                        curmode in self.passthrough,
-                                        is_non_alnum, filter_this))
+                            "{} (focused: {!r})".format(
+                                handled, self._forward_unbound_keys,
+                                curmode in self.passthrough,
+                                is_non_alnum, filter_this,
+                                QApplication.instance().focusWidget()))
         return filter_this
 
     def _eventFilter_keyrelease(self, event):

qutebrowser/widgets/mainwindow.py

@@ -215,7 +215,7 @@ class MainWindow(QWidget):
         cmd.got_cmd.connect(self._commandrunner.run_safely)
         cmd.got_search.connect(search_runner.search)
         cmd.got_search_rev.connect(search_runner.search_rev)
-        cmd.returnPressed.connect(tabs.setFocus)
+        cmd.returnPressed.connect(tabs.on_cmd_return_pressed)
         search_runner.do_search.connect(tabs.search)
         tabs.got_cmd.connect(self._commandrunner.run_safely)
 

qutebrowser/widgets/statusbar/command.py

@@ -153,6 +153,7 @@ class Command(misc.MinimalLineEditMixin, misc.CommandLineEdit):
             # won't change, so we make sure we emit update_completion.
             self.update_completion.emit(self.prefix(), self.split(),
                                         self._cursor_part)
+        log.modes.debug("Setting command text, focusing {!r}".format(self))
         self.setFocus()
         self.show_cmd.emit()
 
@@ -212,6 +213,7 @@ class Command(misc.MinimalLineEditMixin, misc.CommandLineEdit):
             text += ' '
         self.setText(text)
         log.completion.debug("Placing cursor after '{}'".format(cursor_str))
+        log.modes.debug("Completion triggered, focusing {!r}".format(self))
         self.setCursorPosition(len(cursor_str))
         self.setFocus()
         self.show_cmd.emit()

qutebrowser/widgets/statusbar/prompter.py

@@ -162,6 +162,8 @@ class Prompter(QObject):
             mode = usertypes.KeyMode.prompt
         else:
             raise ValueError("Invalid prompt mode!")
+        log.modes.debug("Question asked, focusing {!r}".format(
+            prompt.lineedit))
         prompt.lineedit.setFocus()
         self.show_prompt.emit()
         self._busy = True

qutebrowser/widgets/tabbedbrowser.py

@@ -497,6 +497,7 @@ class TabbedBrowser(tabwidget.TabWidget):
         """Give focus to current tab if command mode was left."""
         if mode == usertypes.KeyMode.command:
             widget = self.currentWidget()
+            log.modes.debug("Left command mode, focusing {!r}".format(widget))
             if widget is None:
                 return
             widget.setFocus()
@@ -508,6 +509,7 @@ class TabbedBrowser(tabwidget.TabWidget):
             # closing the last tab (before quitting)
             return
         tab = self.widget(idx)
+        log.modes.debug("Current tab changed, focusing {!r}".format(tab))
         tab.setFocus()
         modeman.maybe_leave(self._win_id, usertypes.KeyMode.hint,
                             'tab changed')
@@ -520,6 +522,11 @@ class TabbedBrowser(tabwidget.TabWidget):
         self._tab_insert_idx_left = self.currentIndex()
         self._tab_insert_idx_right = self.currentIndex() + 1
 
+    @pyqtSlot()
+    def on_cmd_return_pressed(self):
+        """Set focus when the commandline closes."""
+        log.modes.debug("Commandline closed, focusing {!r}".format(self))
+
     def on_load_progress(self, tab, perc):
         """Adjust tab indicator on load progress."""
         try:

qutebrowser/widgets/webview.py

@@ -328,6 +328,7 @@ class WebView(QWebView):
     @pyqtSlot('QMouseEvent')
     def on_mouse_event(self, evt):
         """Post a new mouseevent from a hintmanager."""
+        log.modes.debug("Hint triggered, focusing {!r}".format(self))
         self.setFocus()
         QApplication.postEvent(self, evt)