bug#39977: 28.0.50; Unhelpful stack trace

[martin rudalics]

> You are proposing that we find all the places where SELECTED_FRAME is
> used and fix them one by one?  I thought it could be better to fix
> them all at once as part of SELECTED_FRAME.

We are still miscommunicating.  I only want to fix the parts that
restore selected_frame so to make sure that they never set it to a dead
frame.  See the attached selected_frame.diff.

martin

selected_frame.diff
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