split Window.SetMonitor into two sub-functions

window.go

@@ -260,26 +260,7 @@ func (w *Window) Hide() {
 	})
 }
 
-// SetMonitor sets a window fullscreen on a given monitor. If the monitor is nil, the window
+func (w *Window) setFullscreen(monitor *Monitor) {
-// will be resored to windowed instead.
-//
-// Note, that there is nothing about the resolution of the fullscreen window. The window is
-// automatically set to the monitor's resolution. If you want a different resolution, you need
-// to set it manually with SetSize method.
-func (w *Window) SetMonitor(monitor *Monitor) {
-	if w.Monitor() != monitor {
-		if monitor == nil {
-			mainthread.Call(func() {
-				w.window.SetMonitor(
-					nil,
-					w.restore.xpos,
-					w.restore.ypos,
-					w.restore.width,
-					w.restore.height,
-					0,
-				)
-			})
-		} else {
 	mainthread.Call(func() {
 		w.restore.xpos, w.restore.ypos = w.window.GetPos()
 		w.restore.width, w.restore.height = w.window.GetSize()
@@ -296,6 +277,33 @@ func (w *Window) SetMonitor(monitor *Monitor) {
 		)
 	})
 }
+
+func (w *Window) setWindowed() {
+	mainthread.Call(func() {
+		w.window.SetMonitor(
+			nil,
+			w.restore.xpos,
+			w.restore.ypos,
+			w.restore.width,
+			w.restore.height,
+			0,
+		)
+	})
+}
+
+// SetMonitor sets a window fullscreen on a given monitor. If the monitor is nil, the window
+// will be resored to windowed instead.
+//
+// Note, that there is nothing about the resolution of the fullscreen window. The window is
+// automatically set to the monitor's resolution. If you want a different resolution, you need
+// to set it manually with SetSize method.
+func (w *Window) SetMonitor(monitor *Monitor) {
+	if w.Monitor() != monitor {
+		if monitor != nil {
+			w.setFullscreen(monitor)
+		} else {
+			w.setWindowed()
+		}
 	}
 }