Don't filter events if mainwindow is not focused

TODO

@@ -11,8 +11,6 @@ Before 0.1
 - Autosave feature (against segfaults/...)
 - Save tabs feature
 - More dwb keybindings
-- Filter events in QMainWindow, not QApplication
-    or at least release them when opening other windows, e.g. print dialog
 - Use  :open engine searchterm   syntax for searching
 
 Crashes

qutebrowser/app.py

@@ -135,6 +135,7 @@ class QuteBrowser(QApplication):
         self._init_cmds()
         self.mainwindow = MainWindow()
 
+        self.modeman.mainwindow = self.mainwindow
         self.installEventFilter(self.modeman)
         self.setQuitOnLastWindowClosed(False)
 
@@ -399,13 +400,6 @@ class QuteBrowser(QApplication):
 
         self._quit_status['crash'] = False
 
-        # Give key input back for crash dialog
-        try:
-            self.removeEventFilter(self.modeman)
-        except AttributeError:
-            # self.modeman could be None
-            pass
-
         if exctype is BdbQuit or not issubclass(exctype, Exception):
             # pdb exit, KeyboardInterrupt, ...
             try:

qutebrowser/keyinput/modeman.py

@@ -62,6 +62,7 @@ class ModeManager(QObject):
     Attributes:
         mode: The current mode (readonly property).
         passthrough: A list of modes in which to pass through events.
+        mainwindow: The mainwindow object
         _handlers: A dictionary of modes and their handlers.
         _mode_stack: A list of the modes we're currently in, with the active
                      one on the right.
@@ -84,6 +85,7 @@ class ModeManager(QObject):
 
     def __init__(self, parent=None):
         super().__init__(parent)
+        self.mainwindow = None
         self._handlers = {}
         self.passthrough = []
         self._mode_stack = []
@@ -248,7 +250,10 @@ class ModeManager(QObject):
             logging.debug("Ignoring event {} for {}".format(
                 debug.EVENTS[typ], obj.__class__.__name__))
             return False
-
+        if QApplication.instance().activeWindow() is not self.mainwindow:
+            # Some other window (print dialog, etc.) is focused so we pass
+            # the event through.
+            return False
         logging.debug("Got event {} for {} in mode {}".format(
             debug.EVENTS[typ], obj.__class__.__name__, self.mode))