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libdraw: work arround devdraw truncating screenid as 16bit

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

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

@@ -29,7 +29,7 @@

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

 		if(a == 0)

 			break;

-		id = ++screenid;

+		id = ++screenid & 0xfffff;	/* old devdraw bug */

 		a[0] = 'A';

 		BPLONG(a+1, id);

 		BPLONG(a+5, image->id);