Enable borderless_game for winit on macos

[TarekAS]

Problem

Borderless Fullscreen on macOS does not hide the menu bar.

Fixes: #14783

Solution

winit 0.30 added a window attribute that hides the dock and menu bar when using on macOS. This exposes that option as a field on Bevy's component, defaulting to true since this is the expected behavior in games.

Testing

Tested by setting

DefaultPlugins.set(WindowPlugin {
    primary_window: Some(Window {
        mode: WindowMode::BorderlessFullscreen(MonitorSelection::Primary),
...

Launch the bevy app, and you should see that the menu bar is hidden.

Showcase

Before:

After:

Known Issues

rust-windowing/winit#4477 - when switching spaces (e.g. using mission control), the menu bar regains visibility -- fixed by rust-windowing/winit#4482

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[Smerom]

From the screenshots it looks like the menu bar is still taking up space, just with the icons hidden. Is that the case?

[TarekAS]

That is the menu bar and notch area. To my knowledge all games have that blacked out as they don't want to stretch over that area (which would make the notch visible and also change the aspect ratio from 16:10 to something like 15.4:10)

[kfc35]

Tested this on Sequoia and it works as expected.

Before: after initializing into borderless full screen mode, the menu bar becomes visible if you move the cursor over it
After: after initializing into borderless full screen mode, the menu bar stays invisible even if you move the cursor over it