[PATCH 0/5]: Various dix window cleanups

[Adam Jackson]

Was staring at this code recently trying to figure out a bug.  Didn't succeed
yet, but I may as well leave it nicer than I found it.  2-4 are mostly to make
the logic of the callers more readable, 5 removes a hack that Composite is no
longer using.  Small code size win:

   text    data     bss     dec     hex filename
1573725   32090   59360 1665175  196897 Xvfb-before
1573230   32090   59360 1664680  1966a8 Xvfb-after

Imperceptable performance difference:

 before          after           Operation
--------   -----------------   -----------------
1177605.5   1207342.2 (  1.03)   Map window via parent (4 kids) 
1541016.2   1577507.5 (  1.02)   Map window via parent (16 kids) 
1599218.2   1623316.1 (  1.02)   Map window via parent (25 kids) 
1428492.1   1437949.0 (  1.01)   Map window via parent (50 kids) 
1322784.9   1337675.3 (  1.01)   Map window via parent (75 kids) 
1241169.2   1260609.7 (  1.02)   Map window via parent (100 kids) 
 983159.1    980600.2 (  1.00)   Map window via parent (200 kids) 
2954438.0   2931223.6 (  0.99)   Unmap window via parent (4 kids) 
5356538.3   5243219.4 (  0.98)   Unmap window via parent (16 kids) 
5886038.4   5869729.0 (  1.00)   Unmap window via parent (25 kids) 
6372664.9   6412601.5 (  1.01)   Unmap window via parent (50 kids) 
6726258.3   6608219.8 (  0.98)   Unmap window via parent (75 kids) 
6706023.1   6615141.3 (  0.99)   Unmap window via parent (100 kids) 
6971058.7   6889147.0 (  0.99)   Unmap window via parent (200 kids) 

- ajax