bug#7153: 24.0.50; ediff-clone-buffer-for-region-comparison

bug#7153: 24.0.50; ediff-clone-buffer-for-region-comparison

[Stephen Berman]

1. emacs -Q
2. M-x ediff-regions-linewise, type RET twice to use *scratch* for both
   Ediff buffers (it doesn't matter which buffers are used).
3. Try to select a region with the mouse
=> Emacs beeps and announces the error "mouse-drag-track: The mark is
not set now, so there is no region" 

This happens on any click of the mouse in the buffer.  Nevertheless, it
is possible to select a region by dragging the mouse with mouse-1
pressed.  Subsequently, further mouse clicks do not raise an error any
more.  The bug also happens if I visit a file and call
ediff-regions-linewise on it.

If I comment out the line
    (ediff-activate-mark)
in ediff-clone-buffer-for-region-comparison (in ediff-util.el), then
eval that function, visit a file and call ediff-regions-linewise, then
clicking with mouse-1 does not raise an error.

I observe this bug since r101737, which fixed bug#7044.  That bug
prevented even trying step 3 in the above recipe, so I don't know if the
fix introduced the mouse-drag-track bug or revealed it.


In GNU Emacs 24.0.50.1 (i686-pc-linux-gnu, GTK+ Version 2.18.6)
 of 2010-10-03 on escher
Windowing system distributor `The X.Org Foundation', version 11.0.10605000
configured using `configure  '--without-toolkit-scroll-bars''

bug#7153: 24.0.50; ediff-clone-buffer-for-region-comparison

[Lars Ingebrigtsen]

Stephen Berman <stephen.berman@gmx.net> writes:

> 1. emacs -Q
> 2. M-x ediff-regions-linewise, type RET twice to use *scratch* for both
>    Ediff buffers (it doesn't matter which buffers are used).
> 3. Try to select a region with the mouse
> => Emacs beeps and announces the error "mouse-drag-track: The mark is
> not set now, so there is no region" 

(I'm going through old bug reports that unfortunately weren't resolved
at the time.)

I'm unable to reproduce this problem in Emacs 29.  Are you still seeing
this problem in recent Emacs versions?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#7153: 24.0.50; ediff-clone-buffer-for-region-comparison

[Stephen Berman]

On Tue, 10 May 2022 04:12:42 +0200 Lars Ingebrigtsen <larsi@gnus.org> wrote:

> Stephen Berman <stephen.berman@gmx.net> writes:
>
>> 1. emacs -Q
>> 2. M-x ediff-regions-linewise, type RET twice to use *scratch* for both
>>    Ediff buffers (it doesn't matter which buffers are used).
>> 3. Try to select a region with the mouse
>> => Emacs beeps and announces the error "mouse-drag-track: The mark is
>> not set now, so there is no region"
>
> (I'm going through old bug reports that unfortunately weren't resolved
> at the time.)
>
> I'm unable to reproduce this problem in Emacs 29.  Are you still seeing
> this problem in recent Emacs versions?

No, I can't reproduce it now either.

Steve Berman

bug#7153: 24.0.50; ediff-clone-buffer-for-region-comparison

[Lars Ingebrigtsen]

Stephen Berman <stephen.berman@gmx.net> writes:

> No, I can't reproduce it now either.

Thanks for checking; I'm closing this bug report, then.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no