Behavior relating to hovering is more solid

event.go

@@ -315,14 +315,14 @@ func (window *window) handleMotionNotify (
 	for _, child := range window.drags {
 		if child == nil { continue }
 		child.handleMouseMove()
-		window.hover(child)
 		handled = true
 	}
 
+	underneath := window.boxUnder(image.Pt(x, y))
+	window.hover(underneath)
+	
 	if !handled {
-		underneath := window.boxUnder(image.Pt(x, y))
 		underneath.handleMouseMove()
-		window.hover(underneath)
 	}
 }
 

system.go

@@ -119,13 +119,9 @@ func (window *window) focus (box anyBox) {
 	window.focused = box
 	
 	if previous != nil {
-		// FIXME why are we invalidating draw here
-		window.invalidateDraw(previous)
 		previous.handleFocusLeave()
 	}
 	if box != nil && box.canBeFocused() {
-		// FIXME why are we invalidating draw here
-		window.invalidateDraw(box)
 		box.handleFocusEnter()
 	}
 }