bug#41156: margins interfere with xterm-mouse-mode

[Lars Ingebrigtsen <larsi@gnus.org>]

Neil Okamoto <neil.okamoto@gmail.com> writes:

> After further testing, I wanted to clarify that this occurs even
> without linum-mode.  It occurs whenever there are window margins to
> either side of the vertical divider.
>
> So, e.g. 
>
> $ emacs -nw -q
>     M-x xterm-mouse-mode
>     C-x b *scratch*
>     C-x 3
>
>     Use the mouse to drag the vertical divider right and left? Succeeds.
>
> Now set a right margin on the left window:
>
>     (set-window-margins (selected-window) 0 2)
>
>     Use the mouse to drag the vertical divider to the left?
>     Fails with the message “<right-margin> <mouse-movement> is undefined”

(I'm going through old bug reports that unfortunately got no response at
the time.)

Testing this in Emacs 28, I do not get any errors (but I can reproduce
the issue in Emacs 27.1.)  However -- it still doesn't work: When
dragging the divider to the left, nothing happens.  (Dragging to the
right works fine.)

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