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bug#26650: 26.0.50; Protect *Backtrace* from accidental killing

From: Tino Calancha
Subject: bug#26650: 26.0.50; Protect *Backtrace* from accidental killing
Date: Tue, 25 Apr 2017 22:02:20 +0900 (JST)
User-agent: Alpine 2.20 (DEB 67 2015-01-07)

On Tue, 25 Apr 2017, address@hidden wrote:

tags 26650 patch

Tino Calancha <address@hidden> writes:

That's because you're still in the recursive edit, it's like evaluating
'(error "hi")' before hitting 'q' in the *Backtrace* buffer.  You can
use C-M-c (exit-recursive-edit) to get back to normal.  I think it would
make sense to do that automatically if you kill the *Backtrace* buffer.
Yes, it would be useful.  I don't know how, though.
Sometimes i kill *Bactrace* from *Ibuffer*/*Buffer List* with the
recursive edit still ongoing.  It's a classical mistake.

Actually, the obvious way of adding `top-level' (that's what 'q' does)
to `kill-buffer-hook' does protect *Backtrace* from killing.
Good!  It solves the issue.

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