internal/uidriver/glfw: Bug fix: Always wait for SetFramebuffer

In case when the callback is not called, let's use timeout.

Updates #1618

internal/uidriver/glfw/ui.go

@@ -1208,15 +1208,22 @@ func (u *UserInterface) setWindowSize(width, height int, fullscreen bool) {
 				ch <- struct{}{}
 			})
 			u.window.SetSize(newW, newH)
-			if w, h := u.window.GetSize(); w != oldW || h != oldH {
-			event:
-				for {
-					glfw.PollEvents()
-					select {
-					case <-ch:
-						break event
-					default:
-					}
+			// Just after SetSize, GetSize is not reliable especially on Linux/Windows.
+			// Let's wait for FramebufferSize callback in any cases.
+
+			// Use the timeout as FramebufferSize event might not be fired (#1618).
+			t := time.NewTimer(time.Second)
+			defer t.Stop()
+
+		event:
+			for {
+				glfw.PollEvents()
+				select {
+				case <-ch:
+					break event
+				case <-t.C:
+					break event
+				default:
 				}
 			}
 			u.window.SetFramebufferSizeCallback(nil)