#100 Fix gel link button dimensions on the left

During !130 (merged) I noticed that some wider gel buttons were still clipping their text and tried to fix that in !130 (merged) - unfortunately, that "fix" broke how their height was handled when there were too many buttons to fit in height (didn't test with a screen full of buttons there).

This current fix works as expected - but the code looks cumbersome. I have to admit that I am still unable to comprehend fully how the Qt layout system should be used with nested widgets and layouts.