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

@@ -1208,17 +1208,24 @@ 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 {
+			// 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)
 			close(ch)
 		}