bug#16738: Errors while resizing vertically

[martin rudalics]

> My change adjusted set-window-new-pixel so that it rejects attempts to
> set the new pixel size to a negative value. Here, new-pixel is currently
> 0, so (set-window-new-pixel window-17 t) is attempting to change
> new-pixel to be -17.

Indeed.  Storing a negative pixel value is an error.

> Are negative new-pixel values allowed?  If so, the attached patch should
> fix the problem.  If not, the problem's probably in the caller.

There was a bug in the caller - hopefully fixed now.  No further action
needed from your side.

Thanks, martin