bug#38181: Actual height of mode-line not taken into account

[martin rudalics]

> By looking at these functions you could derive a new one
> that calculates mode line heights in a similar way and peruse the return
> values of that function in 'window-text-pixel-size' in the hope that
> they won't change with the next redisplay.  The 'mode-lines' argument of
> 'window-text-pixel-size' should then accept a value like 'update' to
> reflect this special use case.  It might be worth the experience.

Or try the attached patch on master.  It seems to fix the issue here.

martin

xdisp.c.diff
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