Thanks for trying!

 > It applies, but compilation fails:
 >
 > window.c: In function ‘Fdisplay_buffer’:
 > window.c:3853: error: too few arguments to function ‘window_min_size_2’
 > window.c:3868: error: too few arguments to function ‘window_min_size_2’
 >
 > Are you missing a piece from your patch?

Honestly I didn't care about these - my `display-buffer' is in window.el
for quite some time.  Please try again with the versions of window.h and
dispnew.c I sent earlier and the patch for window.c now attached.  Sorry
for the inconvenience.