Make the system menu dark themed when using the dark theme

[turt2live]

This might be hard, because Windows.

[yangm97]

There are some possible solutions on macOS:

1. Use the native dark theme API
   Works only on Mojave and later.

2. Use the native bar tint API
   Seems to work as far as Yosemite (afaik), is used by Sublime Text, Telegram, etc. Can be tinted with any color.

3. Ignore the title bar completely and add system buttons on top
   Idk if there's an API for that, but it looks like most electron apps pick this one so it shouldn't be hard.

[starcraft66]

This would be really, really, really appreciated!

[starcraft66]

Upon further inspection, a quick and dirty way of getting this working on macOS 10.14+ is setting the NSRequiresAquaSystemAppearance to false in the application's Info.plist file as per https://developer.apple.com/documentation/appkit/nsappearancecustomization/choosing_a_specific_appearance_for_your_app.

However, electron also apparently has built-in APIs to manage the title bar colour: electron/electron#13387

[lena-kze]

would be nice

[dbkr]

Fixed by #11140