Allow to add padding to ScrollBars
#112441
Open
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(A comparison between the default scrollbar and one with left/right padding plus top/bottom content margins in the
scrolltheme element)This PR adds a set of
padding_*theme constants with all four directions, with the horizontal ones being used forVScrollBar, and the vertical ones forHScrollBar.This inversely mirrors the behavior of the content margins in the
scrolltheme element, where the horizontal margins are present inHScrollBar, and the vertical ones in are inVScrollBar.Helps address #112296 (comment).
Because that would result in a compatibility break, as some users make use of them to increase the minimum size. Even the Godot editor and the default project theme make use of them for that.