bug#18195: 24.3.92; window-screen-lines is not accurate

[martin rudalics]

>>   >> It might be a bit clumsy to work with because you have to
>>   >> temporarily show another buffer in its window
>>   >
>>   > That _is_ the problem.  Momentarily flashing some text in some window
>>   > is not my idea of a good application.  It simply looks like a bug.
>>
>> Well, nobody asked for such a feature so far.  Can you fix it so it
>> simply works on the current buffer instead of the window's buffer?
>
> Fix what exactly?  What is "it" in this context?

`window-text-pixel-size'.  Never mind.  I'll find a fix.

martin