Close #1773

Fixed an infinite loop.
Fixed aspect ratio extraction.

Fix the leak caused by the QGridLayout of the FS controller, since it isn't a child of FullScreenController, and therefore not destroyed at exit.
Should fix #1677

First part of #1740

This needs double-check.

that doesn't update the QAction checked state when QMenu is hidden

Fix #1742

Close #1699 for Qt.

Spotted-by: Cristian Secară

Correctly detect unsupported AR.

Fix the output order on new slice.

Fixes a crash in Close() of the module.

Properly lock spu variable inside UpdateSPU.

No, locking is NOT something you can just igore !

chance to get a frame when they ask (close #1738).

Decoders and filters share the same pool of video frames. But the
decoders try to decode as fast as possible, using all buffers. Then it
s pure luck if the filter can grab a frame...