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paint: wait for mouseup after floodfill

--- a/sys/src/cmd/paint.c

+++ b/sys/src/cmd/paint.c

@@ -609,6 +609,9 @@

 					save(canvas->r, 1);

 					floodfill(p, img);

 					update(nil);

+					/* wait for mouse release */

+					while(event(&e) == Emouse && (e.mouse.buttons & 7) != 0)

+						;

 					break;

 				}

 				r = Rect(p.x-brush, p.y-brush, p.x+brush+1, p.y+brush+1);

-- 

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