XFree86-xserv-4.3.0-51 Performance Improvement

[Harold L Hunt II]

Takuma Murakami made an improvement to the multi-window code in the 
4.3.0-51 release that restricts redraws to only the changed portions of 
windows.  My earlier review of the original code made me believe that 
the code was redrawing the entire contents of each window, regardless of 
whether they had changed any or not, so I believe that Takuma's change 
is correct.  In addition, I tested Takuma's change on a program that was 
notorious for exhibiting bad performance in multi-window mode: xfig. 
4.3.0-50 requires 7 seconds to start xfig and there is lots of screen 
flashing during that startup process; other X Servers on Windows did not 
have this problem.  4.3.0-51 takes 2 seconds to start xfig and there is 
no longer any screen flashing.

Takuma's changes are great!  :)

Harold