[Feature]: Allow Theme Color In FullScreen

[EmreSURK]

Is there an existing issue for this?

• I have searched the existing issues

Is your feature request related to a problem? Please describe.

When VSCode becomes fullscreen on macOS, the theme color not using for the background, and this causes a colorless, dead visual.

Describe your idea or feature request

When VSCode is fullscreen, use the theme's background color.

Describe alternatives you've considered

As an alternative, we can apply the native approach as I mentioned in this issue:
#37 (comment)

[illixion]

As mentioned in #37 (comment), this is affected by a .monaco-workbench.fullscreen background-color setting. Need to ensure that this works properly on macOS and Windows before implementing it.

Feel free to use the Vibrancy custom import feature in the meantime using this CSS:

.monaco-workbench.fullscreen {
	background-color: transparent !important;
}