internal/ui: bug fix: skip focus check for the first update

internal/ui/ui_glfw.go

@@ -83,6 +83,7 @@ type userInterfaceImpl struct {
 
 	// bufferOnceSwapped must be accessed from the main thread.
 	bufferOnceSwapped bool
+	updateOnceCalled  bool
 
 	origWindowPosX        int
 	origWindowPosY        int
@@ -1276,6 +1277,10 @@ func (u *UserInterface) setFPSMode(fpsMode FPSModeType) error {
 
 // update must be called from the main thread.
 func (u *UserInterface) update() (float64, float64, error) {
+	defer func() {
+		u.updateOnceCalled = true
+	}()
+
 	if err := u.error(); err != nil {
 		return 0, 0, err
 	}
@@ -1383,7 +1388,9 @@ func (u *UserInterface) update() (float64, float64, error) {
 		}
 	}
 
-	for !u.isRunnableOnUnfocused() {
+	// If isRunnableOnUnfocused is false and the window is not focused, wait here.
+	// For the first update, skip this check as the window might not be seen yet in some environments like ChromeOS (#3091).
+	for !u.isRunnableOnUnfocused() && u.updateOnceCalled {
 		// In the initial state on macOS, the window is not shown (#2620).
 		visible, err := u.window.GetAttrib(glfw.Visible)
 		if err != nil {