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libdraw: use pid as initial screenid so one can have more than 25 windows.

--- a/sys/src/libdraw/window.c

+++ b/sys/src/libdraw/window.c

@@ -22,6 +22,8 @@

 	s = malloc(sizeof(Screen));

 	if(s == 0)

 		return 0;

+	if(!screenid)

+		screenid = getpid();

 	for(try=0; try<25; try++){

 		/* loop until find a free id */

 		a = bufimage(d, 1+4+4+4+1);

-- 

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