Output box scrolling issues

[philipstarkey]

Original report (archived issue) by Shaun Johnstone (Bitbucket: shjohnst, GitHub: shjohnst).

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I haven't paid enough attention to be able to pinpoint what exact circumstances lead to it, but quite often in qt-runmanager the output box will end up with lots of extra whitespace (well, blackspace I guess!) at the bottom, pushing the printed information to the top of the screen. It seems to be related to changing tabs. It seems to catch up with itself when you get it to sit at the bottom of the scroll bar while a labscript is compiling and spitting out lines to be printed in the box.