Dispatch ResizeEvent after drawing

This commit changes the Unix screen to dispatch events after drawing.
This helps draw interceptors update its states in time before the user
gets the event.

tscreen.go

@@ -197,7 +197,7 @@ func (t tScreen) Init() error {
 	t.cells.Resize(w, h)
 	t.cursorx = -1
 	t.cursory = -1
-	t.resize()
+	t.resize(true)
 	t.Unlock()
 
 	if err := t.engage(); err != nil {
@@ -784,8 +784,9 @@ func (t tScreen) TPuts(s string) {
 func (t tScreen) Show() {
 	t.Lock()
 	if !t.fini {
-		t.resize()
+		t.resize(false)
 		t.draw()
+		t.dispatchResizeEvent()
 	}
 	t.Unlock()
 }
@@ -1526,8 +1527,9 @@ func (t tScreen) mainLoop(stopQ chan struct{}) {
 			t.Lock()
 			t.cx = -1
 			t.cy = -1
-			t.resize()
+			t.resize(false)
 			t.draw()
+			t.dispatchResizeEvent()
 			t.Unlock()
 			continue
 		case <-t.keytimer.C:
@@ -1595,10 +1597,11 @@ func (t tScreen) Sync() {
 	t.cx = -1
 	t.cy = -1
 	if !t.fini {
-		t.resize()
+		t.resize(false)
 		t.clear = true
 		t.cells.Invalidate()
 		t.draw()
+		t.dispatchResizeEvent()
 	}
 	t.Unlock()
 }