tests: Add avm2/focus_remove test

This test verifies the behavior of stage.focus
when the focus is removed from the stage.

tests/tests/swfs/avm2/focus_remove/Test.as

@@ -0,0 +1,44 @@
+package {
+
+import flash.display.DisplayObject;
+import flash.display.InteractiveObject;
+import flash.display.InteractiveObject;
+import flash.display.InteractiveObject;
+import flash.display.SimpleButton;
+import flash.display.Sprite;
+import flash.events.KeyboardEvent;
+import flash.text.TextField;
+import flash.text.TextField;
+import flash.display.Sprite;
+import flash.display.SimpleButton;
+import flash.display.MovieClip;
+import flash.events.Event;
+import flash.events.FocusEvent;
+
+[SWF(width="50", height="50", backgroundColor="#000000")]
+public class Test extends MovieClip {
+    public function Test() {
+        super();
+
+        trace("===== sprite");
+        testObject(new Sprite());
+        trace("===== clip");
+        testObject(new MovieClip());
+        trace("===== text");
+        testObject(new TextField());
+        trace("===== button");
+        testObject(new SimpleButton());
+    }
+
+    function testObject(obj:InteractiveObject) {
+        stage.focus = obj;
+        trace("Focus: " + stage.focus);
+        stage.addChild(obj);
+        trace("Focus: " + stage.focus);
+        stage.removeChild(obj);
+        trace("Focus: " + stage.focus);
+        stage.focus = obj;
+        trace("Focus: " + stage.focus);
+    }
+}
+}

tests/tests/swfs/avm2/focus_remove/output.txt

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+===== sprite
+Focus: [object Sprite]
+Focus: [object Sprite]
+Focus: null
+Focus: [object Sprite]
+===== clip
+Focus: [object MovieClip]
+Focus: [object MovieClip]
+Focus: null
+Focus: [object MovieClip]
+===== text
+Focus: [object TextField]
+Focus: [object TextField]
+Focus: null
+Focus: [object TextField]
+===== button
+Focus: [object SimpleButton]
+Focus: [object SimpleButton]
+Focus: null
+Focus: [object SimpleButton]

tests/tests/swfs/avm2/focus_remove/test.toml

@@ -0,0 +1 @@
+num_ticks = 1