Use NSApp.keyWindow Over Global keyWindow

[thecoolwinter]

Description

In the current build, using command-W throws an exception. This fixes that by swapping out the use of the global keyWindow with NSApp.keyWindow.

This error appears to have appeared recently, but the global keyWindow should never have been used in the first place. It may have been the case that the use of this variable was previously linked to a different, similarly named, one by the compiler. But it now points to this header.

I've also added UI tests for all windows for the command-w command, and the command-shift-w command in workspaces.

Related Issues

• None opened yet.

Checklist

• I read and understood the contributing guide as well as the code of conduct
• The issues this PR addresses are related to each other
• My changes generate no new warnings
• My code builds and runs on my machine
• My changes are all related to the related issue above
• I documented my code

[plbstl]

Insane. This also helped with a bug when working on #1820. After interacting with a preview, pressing cmd+w does nothing, pressing the keybinding again throws an exception.

#1796. This fix also doesn't let cmd w close the 'Open Quickly' and 'Quick Actions' modals. Although, the selected tab still closes.