bug#19428: 25.0.50; Frame is wider (in chars) than normal non-deterministically

[martin rudalics]

The following excerpts are from
http://debbugs.gnu.org/cgi/bugreport.cgi?bug=19428#18.  Sorry, but
gmx.de refused to pass on some of the previous postings.

> I was able to bisect this problem to commit
> 3477e27021dbe9366c3c1aaba80feb72f1138b29
>
> "Complete pixelwise frame/window resizing, add horizontal scrollbar
> support."

Thanks for bisecting this.  Highly appreciated (even if the result was
somewhat predictable).

> Good:
>
> [good.txt (text/plain, inline)]
>
> frame pixel: 756 x 682   cols/lines: 84 x 34   units: 9 x 19
> frame text pixel: 720 x 646   cols/lines: 80 x 34
> tool: 36  scroll: 18/0  fringe: 16  border: 1  right: 0  bottom: 0
> [...]
> Bad:
>
> [bad.txt (text/plain, inline)]
>
> frame pixel: 792 x 720   cols/lines: 88 x 36   units: 9 x 19
> frame text pixel: 756 x 684   cols/lines: 84 x 36
> tool: 36  scroll: 18/0  fringe: 16  border: 1  right: 0  bottom: 0

The good and bad values are so hilariously different that some silly
code must have been at work here.  I checked in a fix on master/trunk
with commit 8c38c2b77a5f0b256948bda0d3f9b6272483a42d.  Please try it.

Thanks for all your work on this, martin