internal/ui: catch an error at At at updateIconIfNeeded

Closes #2647

internal/ui/context.go

@@ -147,7 +147,9 @@ func (c *context) updateFrameImpl(graphicsDriver graphicsdriver.Graphics, update
 
 	// Update window icons during a frame, since an icon might be *ebiten.Image and
 	// getting pixels from it needs to be in a frame (#1468).
-	ui.updateIconIfNeeded()
+	if err := ui.updateIconIfNeeded(); err != nil {
+		return err
+	}
 
 	// Draw the game.
 	if err := c.drawGame(graphicsDriver, forceDraw); err != nil {

internal/ui/ui_glfw.go

@@ -1113,15 +1113,15 @@ func (u *userInterfaceImpl) updateGame() error {
 	return nil
 }
 
-func (u *userInterfaceImpl) updateIconIfNeeded() {
+func (u *userInterfaceImpl) updateIconIfNeeded() error {
 	// In the fullscreen mode, SetIcon fails (#1578).
 	if u.isFullscreen() {
-		return
+		return nil
 	}
 
 	imgs := u.getIconImages()
 	if len(imgs) == 0 {
-		return
+		return nil
 	}
 
 	u.setIconImages(nil)
@@ -1142,9 +1142,16 @@ func (u *userInterfaceImpl) updateIconIfNeeded() {
 		newImgs[i] = rgba
 	}
 
+	// Catch a possible error at 'At' (#2647).
+	if err := theGlobalState.error(); err != nil {
+		return err
+	}
+
 	u.mainThread.Call(func() {
 		u.window.SetIcon(newImgs)
 	})
+
+	return nil
 }
 
 func (u *userInterfaceImpl) swapBuffersOnRenderThread() {

internal/ui/ui_js.go

@@ -723,7 +723,8 @@ func (u *userInterfaceImpl) beginFrame() {
 func (u *userInterfaceImpl) endFrame() {
 }
 
-func (u *userInterfaceImpl) updateIconIfNeeded() {
+func (u *userInterfaceImpl) updateIconIfNeeded() error {
+	return nil
 }
 
 func IsScreenTransparentAvailable() bool {

internal/ui/ui_mobile.go

@@ -457,7 +457,8 @@ func (u *userInterfaceImpl) beginFrame() {
 func (u *userInterfaceImpl) endFrame() {
 }
 
-func (u *userInterfaceImpl) updateIconIfNeeded() {
+func (u *userInterfaceImpl) updateIconIfNeeded() error {
+	return nil
 }
 
 func IsScreenTransparentAvailable() bool {

internal/ui/ui_nintendosdk.go

@@ -201,7 +201,8 @@ func (u *userInterfaceImpl) beginFrame() {
 func (u *userInterfaceImpl) endFrame() {
 }
 
-func (u *userInterfaceImpl) updateIconIfNeeded() {
+func (u *userInterfaceImpl) updateIconIfNeeded() error {
+	return nil
 }
 
 func IsScreenTransparentAvailable() bool {