Tom Goddard added the comment: More testing shows that this Mac Tk crash with dual displays only happens when the second display is partly or entirely above the primary display in the Mac display system preferences. An attempt to show the tooltip on the second display above the top of the primary display a crash happens. Contrary to my previous comment it does not appear to depend on whether the secondary display is to the right or to the left of the primary display. Possibly the key factor is that the tooltip is being displayed above Mac top of (primary) screen menu bar. It is possible that that is an Apple bug, rather than a Mac Tk bug.
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