x11: set_inner_size after set_fullscreen(None) from Fullscreen::Exlusive is ignored

[rijenkii]

Situation: Window has been set to Some(Fullscreen::Exclusive) with a resolution, that differs from default one (monitor_handle.video_modes().nth(x)). Then, fullscreen is set to None, and window is resized with set_inner_size.

Expected: Window is in windowed mode and resized as expected.

Actual behavior:
Window mode is set to windowed, but window size is set to

• WM: awesomewm: default_video_mode.size() * scale_factor
• WM: xfwm4: size that window had before entering fullscreen
• WM: openbox, plasma: size that window had before entering fullscreen * scale_factor

As if set_inner_size was never called

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gist (Press F to enter fullscreen, W to try to enter windowed, ESC to exit)

Note: Everything is working as expected, if window has been set to a default video mode (monitor_handle.video_modes().next())

[rijenkii]

Funny observation - If you add std::thread::sleep after set_inner_size, window actually gets resized to expected size, but after sleep ends - it resizes to resolutions stated in the OP

[rijenkii]

I have added mode selection and logging of ScaleFactorChanged into the gist
Another interesting observation - when going in and out of fullscreen, winit on x11 sends TWO ScaleFactorChanged events - one from here and second one from here, while on Windows it sends none

[rijenkii]

Another funny observation - if WINIT_X11_SCALE_FACTOR env variable is set to any number - winit behaves just as on Windows - does not send ScaleFactorChanged events when changing modes, and properly resizes window after exiting fullscreen