[Bug: 21.5-b29] error balancing tex-mode window

[Uwe Brauer]

Mike Kupfer wrote:
> ================================================================
> Dear Bug Team!
>
> I have a frame containing 2 windows: one is for a LaTeX source file and
> the other doesn't seem to matter (e.g., dired, random text, etc).  If I
> invoke balance-windows (e.g., C-x +), I get an error with the following
> backtrace:
seems to be 21.5 specific, I don't get this error in 21.4.X

Uwe Brauer