bug#16738: Errors while resizing vertically

[martin rudalics]

> I've tried the new code. With the following:
>
> (setq window-min-height 1)
> (set-face-attribute 'mode-line nil :overline "black")
>
> ,I'm unable to make windows any shorter than 2.

2 canonical lines.  But this is to be expected?  Otherwise, Emacs would
truncate the text line by the extra pixels needed for the mode line.

Whenever using a non-standard sized mode- or header-line _and_ a small
window-min-height/-width I recommend setting `window-resize-pixelwise'
to t.

martin