bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs

[martin rudalics]

> I sincerely hope that question is more addressed to Eli than to me, as I
> have no idea.

Don't worry, it was only a rhetoric question.

> I'm more than happy to run with different breakpoints
> and/or debugging code inserted.

The attached is an attempt to catch the condition where the selected
window's buffer is dead in a couple of strategic places.  Please run
with it in an unoptimized Emacs and wait till an assertion triggers.
Yet another shot in the dark but I have no better idea.

And if you still have the old session in the debugger, please tell us
what the value of old_selected_window is.

Thanks, martin

selected_window_contents.diff
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