widget: clip by most complex shape last

In the new compute renderer, clipping to a complex shape is slower than
filling it. Swap the clip shapes for drawing text so that the text shape
itself is last, and therefore used for filling.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

widget/label.go

@@ -178,8 +178,8 @@ func (l Label) Layout(gtx layout.Context, s text.Shaper, font text.Font, size un
 		}
 		stack := op.Save(gtx.Ops)
 		op.Offset(layout.FPt(off)).Add(gtx.Ops)
-		s.Shape(font, textSize, l).Add(gtx.Ops)
 		clip.Rect(cl.Sub(off)).Add(gtx.Ops)
+		s.Shape(font, textSize, l).Add(gtx.Ops)
 		paint.PaintOp{}.Add(gtx.Ops)
 		stack.Load()
 	}