I tracked down the actual bug. It turns out that in order to get the
flicker, you have to do an invalidate on a canvas control (probably
works with any control that can be invalidated, but easier to see on
a canvas), followed by changing the tabpanel. If you do that, the
canvas erases, then all the update events occur (which refreshes the
canvas).
This happens even if you explicitly tell the invalidate not to erase
the background.
I've updated the bug report with a sample app.
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