darwin: Fix uiWindow fullscreen/borderless/resize interaction.

[szanni]

• Move window display settings to a separate function updateStyleMask().
• Determine full screen by querying the window styleMask.

Fix:

• Window not going into fullscreen when borderless.
• Window not retaining not resizeable when toggling borderless.
• Window not going into fullscreen when not resizeable.

Fixes #190 for me.

Two things to mention:

1. Transitioning from borderless to fullscreen will set borders before transitioning into fullscreen which is visible on my system for a split second. I did not find any way around this.
2. Resize is kept enabled in fullscreen, so that the user can exit fullscreen via the window controls. Querying uiWindowResizeable() will still return false and the correct state is restored when exiting fullscreen.

[szanni]

Updated updateStyleMask() to be static and used cast to BOOL instead of !!.

[cody271]

2. Resize is kept enabled in fullscreen, so that the user can exit fullscreen via the window controls.

In testing the latest here, I noticed that this suffers from a similiar issue as window position page15 test had.
Exiting fullscreen via window controls means the checkbox is then out of sync with the fullscreen state, and the only way to stay in sync is either through polling the state or an event.
Maybe we need to add uiWindowOnFullscreenChanged() like we did for uiWindowOnPositionChanged() ?

[szanni]

In testing the latest here, I noticed that this suffers from a similiar issue as window position page15 test had. Exiting fullscreen via window controls means the checkbox is then out of sync with the fullscreen state, and the only way to stay in sync is either through polling the state or an event. Maybe we need to add uiWindowOnFullscreenChanged() like we did for uiWindowOnPositionChanged() ?

That is correct and while uiWindowFullscreen() does return the correct state, I would love to have a uiWindowOnFullscreenChanged() and some qa instructions for darwin to test full screen via the window decorations.