Win64:
Floating source code tabs can be combined easily by dragging one over the other. And I like how I can differentiate between dragging the title bar of the window, versus dragging the tab (although I will whine about the additional screen real estate

.
But this same functionality does not seem to extend to floating Tools Windows (e.g. Output, Preview, Defs, etc.), even though I can dock them to the same part of the main window, and have tabs show up. When I drag the floating Output window over the floating Preview window, they do not get combined.
Is this By Design? Or is there an option somewhere that I'm missing?
Thanks!
-martin