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

[martin rudalics]

>> In practice this seems to nicely cover the relevant cases:
>>
>> (defun my-redisplay-hack (&rest _)
>>    (when mode-line-format
>>      (redisplay t)))
>> (advice-add #'split-window :after #'my-redisplay-hack)
>
> I wonder how this fixes anything, since split-window already triggers
> redisplay.  Martin, do you understand the difference?

There is no difference in the use cases posted here.  The results will
change only when a window is reused and then fit to its buffer.

>> but there is some flickering because the window is displayed before
>> the fit and then immediately replaced by the fitted version.
>
> Which means there are two redisplay cycles, and the first one (which
> produces incorrect display) is the one from your hack.  So once again,
> I wonder why that call to 'redisplay' is needed.

Where "incorrect redisplay" stands for "window that has not been yet fit
to its buffer".

martin