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bug#25992: perform-replace leaves mark-active when not transient-mark-mo

From: Eli Zaretskii
Subject: bug#25992: perform-replace leaves mark-active when not transient-mark-mode
Date: Mon, 06 Mar 2017 18:26:53 +0200

> Date: Sun, 05 Mar 2017 18:02:23 -0800
> From: Keith David Bershatsky <address@hidden>
> When transient-mark-mode is turned off, perform-replace leaves mark-active 
> set to `t`.
> Step 1:  Launch emacs -q
> Step 2:  Turn off transient-mark-mode.  (transient-mark-mode -1)
> Step 3:  Evaluate mark-active and verify it is `nil`.
> Step 4:  Run a simple perform-replace such as:  (replace-regexp ";" "@" nil 1 
> 2)
> Step 5:  Evaluate mark-active and see that it is now set `t`.
> The desired behavior is to leave `mark-active` set to `nil` if it was 
> previously set to `nil`.

I'm not sure why you worry about mark-active when transient-mark-mode
is off: AFAIK that flag is only meaningful when transient-mark-mode is
on.  Can you describe your use case?

Anyway, the reason for activating the mark is that replace-regexp
calls push-mark, which always activates the mark when
transient-mark-mode is turned off.  Not sure why we do that, but the
code which does that has been doing it for the last 24 years, so I
don't think we should change that now, unless we have a _very_ good


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