Memory leak with awesomeWM when window shape is enabled

[Holi0317]

Related issue: alacritty/alacritty#2004

winit version: 0.18.1

Under X11 with awesomeWM 4.2. Winit would cause awesomeWM to memory leak when client shape decoration is enabled in awesome's end.

Minimal awesome configuration

When a winit screen is launched and screen is turned off by xset dpms force off, memory consumption of awesomeWM starts to rise unusually and eventually cause Linux OOM killer to kill awesomeWM. This issue exist even if the winit client is not rendered on screen.

This issue is resolved when window shape decoration code is commented out (line 561 to line 567 in the config).

Memory usage could be reduced by forcing Lua to do a GC. I thought winit was causing unnecessary manage signal emitted but that was not the case. The signal was not emitted when screen is off.

I was launching an example winit window by the following example code:

use winit;

fn main() {
    let mut events_loop = winit::EventsLoop::new();
    let window = winit::Window::new(&events_loop).unwrap();

    events_loop.run_forever(|event| {
        match event {
            winit::Event::WindowEvent {
              event: winit::WindowEvent::CloseRequested,
              ..
            } => winit::ControlFlow::Break,
            _ => winit::ControlFlow::Continue,
        }
    });
}

[Holi0317]

After updating AwesomeWM to 4.3 or after updating winit, the issue is solved.