bug#23690: 25.0.94; Window resizing regression

[Stephen Berman <stephen.berman@gmx.net>]

On Fri, 03 Jun 2016 15:54:11 +0200 martin rudalics <rudalics@gmx.at> wrote:

>> 0. emacs -Q
>> 1. Type `C-x 3' to split the selected window into two side-by-side
>>     windows.
>> 2. Sanity check: click mouse-1 on the divider between the mode lines,
>>     and observe that by dragging the mouse you can move the vertical
>>     boundary between the windows to the left or right.
>> 3. In the menu Options->Show/Hide->Scroll-bar click the "On the Left"
>>     button to make the scroll bars appear on the left side of the
>>     windows.
>> 4. Repeat step 2.
>> => The vertical boundary between the windows does not change, but
>>     instead the echo area displays the message "No window on the right of
>>     this one" (although the selected window is the one on the left).
>>
>> This is a regression from Emacs 24.5, where step 4 works just like step
>> 2.  Git bisect identifies the following as the responsible commit:
>>
>> commit 3110159d1fb6b6071803355951d9ae314095df36
>> Author: Martin Rudalics <rudalics@gmx.at>
>> Date:   Fri Oct 24 11:58:43 2014 +0200
>>
>>      Improve mouse dragging of frame edges.
>>
>>      * keyboard.c (make_lispy_position): Return coordinates also when
>>      on scroll bars, fringes, margins or not in a window.
>>      * xdisp.c (show_mouse_face): Don't change cursor face during
>>      mouse tracking.
>>      * mouse.el (mouse-drag-line): Don't use mouse-pixel-position.
>>      Calculate increment from last position instead of window edge.
>>      Add right- and bottom-divider bindings to transient map.
>
> Would the attached patch fix it for you?

It does indeed; thanks!

Steve Berman