scene2d.ui, keep SelectBox popup from extending past right edge of st…

…age.

Can happen with setSelectedPrefWidth(true).

CHANGES

@@ -7,6 +7,7 @@
 - New GDX Setup projects now use Gradle 8.4 and AGP Plugin 8.1.2 which require at least Java 17.
 - Fixed Timer#stop, remember time spent stopped and delay tasks when started again. #7281
 - Android: Add configuration option to render under the cutout if available on the device.
+- Fix: Keep SelectBox popup from extending past right edge of stage.
 
 [1.12.1]
 - LWJGL3 Improvement: Audio device is automatically switched if it was changed in the operating system.

gdx/src/com/badlogic/gdx/scenes/scene2d/ui/SelectBox.java

@@ -532,12 +532,19 @@ public void show (Stage stage) {
 				setY(stagePosition.y - height);
 			else
 				setY(stagePosition.y + selectBox.getHeight());
-			setX(stagePosition.x);
+
 			setHeight(height);
 			validate();
 			float width = Math.max(getPrefWidth(), selectBox.getWidth());
 			setWidth(width);
 
+			float x = stagePosition.x;
+			if (x + width > stage.getWidth()) {
+				x -= getWidth() - selectBox.getWidth() - 1;
+				if (x < 0) x = 0;
+			}
+			setX(x);
+
 			validate();
 			scrollTo(0, list.getHeight() - selectBox.getSelectedIndex() * itemHeight - itemHeight / 2, 0, 0, true, true);
 			updateVisualScroll();