Improve performance of QTabWidget::clear #107
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The current implementation of QTabWidget::clear is quite poor because it deletes the tabs from first to last. When I was playing around, I found out it's much faster to delete from last to first (with a lot of tabs it goes from two seconds to 200 milliseconds in my testing). I assume this has to do with the redrawing of all remaining tabs for each removeTab call, while this is not necessary when removing in the reverse order.