I poked at this a little bit, with only negative results. The issue is "limited" to a transit between two widgets with an active tooltip.

See my screen cap:

Initially, hovering the mouse over a button and then away causes the tooltip to appear and vanish without any focus change.

But when moving between two buttons with the tooltip open, that is when a focus change may happen. [i.e. hover over button A, tooltip A appears; move the mouse to button B, tooltip B appears]. It also appears to be related to the speed of the transit.

I think this eliminates the hypothesis of the tooltip being "outside of" the window being the problem. If that was the problem, then a simple "tooltip appears, tooltip vanishes" would also cause a focus change.

I also tried disabling the "possible fix for the Windows titlebar" code. Doing so had no effect.

I believe the problem is at a lower level, i.e. with window transitions. When the mouse leaves button A, the tooltip window is hidden. The mouse enters button B, and the tooltip window is shown. Depending on the speed of the transition, the mouse may be over the parent window for long enough to register a focus change.

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