Single toolbar mode: borders+compact or no border if maximised

[XanderLeaDaren]

The “No Gap” Mod allows to remove the borders around the window, and this could be the default behaviour for Single Toolbar when the user maximise the window or use the browser in fullscreen, as there is no need to “grab” the gap/outline/border decoration to resize the window.

In the above behaviour, these gaps/borders/outline should stay when the window is not maximised/fullscreen, allowing it to be resized.

Eventually, the Compact mode could even be automatically disabled during maximised/fullscreen, as if the window were “docked” to the edges of the screen.