Add ability to ignore insets when global scrollbar is used

[ptziegler]

Having this extra space for the scrollbar looks really out-of-place, given that none of the other views seem to do this. I also get the impression that it doesn't work properly, because

a) Parts of the text seem cut off, because they are behind the scrollbar. b) This extra space temporarily disappears, if one resizes the IDE.

I believe this is done by the ScrollPaneSolver.

[azoitl]

When I debugged the drawing performance I also had the impression that ScrollPaneSolver was somehow doing things it shouldn't do. But I was not fully sure and do not yet fully understand it.

[github-actions[bot]]

This issue is stale because it has been open for 90 days with no activity.

[ptziegler]

Now that the overlay scrollbar can be disabled via Canvas.setScrollbarsMode() and also due to the improvements in the ScrollPaneResolver, I think this has become obsolete.