Assuming this issue effects only one app is defective. Fix the broken
compatibly with legacy code as this solves it for all programs. And
does not require rewriting an unknown number of apps, that probably
don't have maintainers to fix things, to keep working vs. being
rendered unusable.
On 7/30/2
FVWM's problem here appears to be that it calls XCheckIfEvent with a callback
that ends up trying to call XFlush; XCheckIfEvent holds the display lock while
calling the callback and XFlush also locks the display, causing a
self-deadlock. I provoked this by iconifying a window with a key bind, a
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