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libdraw: do not force flushimage() on freescreen()

This causes visual flashes of white in rio. If it is
really needed (it is rare) it should be done by the caller.

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

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

@@ -96,12 +96,6 @@

 	}

 	a[0] = 'F';

 	BPLONG(a+1, s->id);

-	/*

-	 * flush(1) because screen is likely holding last reference to

-	 * window, and want it to disappear visually.

-	 */

-	if(flushimage(d, 1) < 0)

-		goto Error;

 	free(s);

 	return 1;

 }