Re: Separator drifts on repeated resize

[Gerd Moellmann]

Christopher Beland <beland@MIT.EDU> writes:

> In GNU Emacs 20.7.1 (i686-pc-linux-gnu, X toolkit)
>  of Tue May 15 2001 on snuggle.mit.edu
> configured using `configure  --with-x-toolkit --sharedstatedir=/var/tmp 
> --with-pop --with-hesiod --with-kerberos'
> 
> > Please describe exactly what actions triggered the bug
> > and the precise symptoms of the bug:
> 
> Normally, if I do M-x 2, the separator between the two buffers splits
> screen real estate exactly 50/50, i.e., it's right in the vertical
> middle of the screen.
> 
> When I do the following:
>  - Start Emacs (in X)
>  - M-x 2
>  - Grab the bottom of the window and slowly drag it up and down repeatedly
> 
> ...my window manager, namely Sawfish 0.37.3, redraws the contents of
> the Emacs window several times a second.  For some reason - probably
> some sort of rounding error - the separator bar drifts.  When I'm done
> resizing the window, one of the buffers might end up being very much
> smaller than the other.  I would expect Emacs to retain the same
> proportional division of space between buffers no matter how the
> window is resized.

Thanks for the report.  Yes, this is basically a rounding issue.
Window sizes are currently measured in columns/rows, not pixels,
so there's always rounding going on.  It might be that some future
release will use pixels for window sizes; then the effect would
go away.