fix [hack] for crash when dragging a tab to the right edge of a tabbar from another tabbar. #1180
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We need to have our own TabButtonBar, that is able to work correctly with DnD & Overflow
This fix forces all tabs dragged into the right edge of a tabbar to be added before the last. Which stops the index being incorrect if the the tabbar goes into overflow, with the caveat that it may not look correct when tabs move with animating.