io/router: support cursor changes on Frame events

Add support to Router so that the cursor can be changed with CursorNameOp without any mouse movement.
Enter and Leave events are also delivered as areas change.

Signed-off-by: pierre <pierre.curto@gmail.com>

app/window.go

@@ -409,6 +409,7 @@ func (w *Window) run(opts *window.Options) {
 					w.destroy(err)
 					return
 				}
+				w.updateCursor()
 			case *system.CommandEvent:
 				w.out <- e
 				w.waitAck()
@@ -424,10 +425,7 @@ func (w *Window) run(opts *window.Options) {
 					w.setNextFrame(time.Time{})
 					w.updateAnimation()
 				}
-				if c := w.queue.q.Cursor(); c != w.cursor {
-					w.cursor = c
-					w.SetCursorName(c)
-				}
+				w.updateCursor()
 				w.out <- e
 			}
 			w.ack <- struct{}{}
@@ -435,6 +433,13 @@ func (w *Window) run(opts *window.Options) {
 	}
 }
 
+func (w *Window) updateCursor() {
+	if c := w.queue.q.Cursor(); c != w.cursor {
+		w.cursor = c
+		w.SetCursorName(c)
+	}
+}
+
 func (q *queue) Events(k event.Tag) []event.Event {
 	return q.q.Events(k)
 }