Re: Bug in CVS Emacs frame positioning under X

[Jan Djärv]

Richard Stallman wrote:
>     The symptom is that not all of the frames end up positioned at x/y
>     coordinates 300/300.  Some frames are positioned at 300+A/300+B, where
>     A is the width of the left border drawn by the window manager and B is
>     the height of the top border drawn by the window manager.  Some frames
>     even end up at 400/400 !
>
>     I think I have a patch to src/xterm.c that may fix this.  I will try
>     it and let you know if the patch works.

Please also tell which window managers you tested it on.

> This resembles a problem that I struggled with about 10 years ago.
> It might be the same one.
>
> I found that various cases of window positioning were a little bit
> off.  So I would fix the case that failed, and then some other case
> started to fail.  Eventually I gave up.

That is the basic problem.  Each window manager does window moves differently, 
and the fact that events may come at different times complicates things.  I 
now try to make it work on a lot of window managers, but I gave up on "all".

> With better records, perhaps I could have determined the pattern of
> what failed and what succeeded, and figured out an overall solution.
> We should start keeping such records now, in case the patch
> which fixes this case breaks another case.


The patch must be tested on at least 10 or so of the most common window 
managers.  Usually it is difficult to make a patch that doesn't break some 
other window manager.

        Jan D.