v3.0.0: fixed rare freezes with gamescene flashing

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/scenes/GameScene.java

@@ -137,6 +137,7 @@ import com.watabou.noosa.Visual;
 import com.watabou.noosa.audio.Sample;
 import com.watabou.noosa.particles.Emitter;
 import com.watabou.noosa.tweeners.Tweener;
+import com.watabou.utils.Callback;
 import com.watabou.utils.DeviceCompat;
 import com.watabou.utils.GameMath;
 import com.watabou.utils.Point;
@@ -1355,6 +1356,10 @@ public class GameScene extends PixelScene {
 
 	public static void flash( int color, boolean lightmode ) {
 		if (scene != null) {
+			//don't want to do this on the actor thread
+			ShatteredPixelDungeon.runOnRenderThread(new Callback() {
+				@Override
+				public void call() {
 					//greater than 0 to account for negative values (which have the first bit set to 1)
 					if (color > 0 && color < 0x01000000) {
 						scene.fadeIn(0xFF000000 | color, lightmode);
@@ -1362,6 +1367,8 @@ public class GameScene extends PixelScene {
 						scene.fadeIn(color, lightmode);
 					}
 				}
+			});
+		}
 	}
 
 	public static void gameOver() {