tests: Add avm2/edittext_mouse_selection test

This test verifies the behavior of selecting text using mouse.
It takes into account normal, word, and line selection.
Example use cases covered by this test:
1. selecting characters,
2. selecting words by double-clicking,
3. selecting multiple words by double-clicking and dragging,
4. selecting lines by triple-clicking,
5. selecting multiple lines by triple-clicking and dragging,
6. double-clicking at word boundaries,
7. double-clicking between spaces,
8. changing the underlying text while clicking and dragging,
9. trying to select while the text field is not selectable.

Author: kjarosh

tests/tests/swfs/avm2/edittext_mouse_selection/NotoSans.ttf

@@ -0,0 +1,77 @@
+package {
+import flash.display.Sprite;
+import flash.events.KeyboardEvent;
+import flash.events.MouseEvent;
+import flash.events.TextEvent;
+import flash.text.TextField;
+import flash.text.TextFormat;
+import flash.ui.Keyboard;
+
+[SWF(width="400", height="200")]
+public class Test extends Sprite {
+    [Embed(source="NotoSans.ttf", fontName="Noto Sans", embedAsCFF="false", unicodeRange="U+0020-U+007E")]
+    private var notoSans:Class;
+
+    private var text:TextField;
+
+    public function Test() {
+        text = new TextField();
+        text.border = true;
+        text.width = 400;
+        text.height = 200;
+        text.type = "input";
+        text.wordWrap = true;
+        text.multiline = true;
+        var tf = new TextFormat();
+        tf.font = "Noto Sans";
+        tf.size = 24;
+        text.defaultTextFormat = tf;
+        addChild(text);
+
+        stage.focus = text;
+        stage.addEventListener(TextEvent.TEXT_INPUT, textInput);
+        stage.addEventListener(KeyboardEvent.KEY_DOWN, keyPressedDown);
+        stage.addEventListener(MouseEvent.MOUSE_DOWN, mouseDown);
+        stage.addEventListener(MouseEvent.MOUSE_UP, mouseUp);
+        stage.addEventListener(MouseEvent.MOUSE_MOVE, mouseMove);
+    }
+
+    private function keyPressedDown(event:KeyboardEvent):void {
+        if (event.keyCode == Keyboard.ESCAPE) {
+            trace("Selected: " + text.selectedText.replace(/\r/g, "\\n").replace(/\n/g, "\\n"));
+            text.setSelection(0, 0);
+        } else if (event.keyCode == Keyboard.NUMBER_1) {
+            text.text = "word1_word2_word3";
+        } else if (event.keyCode == Keyboard.NUMBER_2) {
+            text.text = "word1 word2 word3";
+        } else if (event.keyCode == Keyboard.NUMBER_3) {
+            text.text = "word1 word2 word3 word4 word5 word6 word7 word8 word9\nword10 word11 word12";
+        } else if (event.keyCode == Keyboard.NUMBER_4) {
+            text.selectable = false;
+        } else if (event.keyCode == Keyboard.NUMBER_5) {
+            text.selectable = true;
+        } else if (event.keyCode == Keyboard.NUMBER_6) {
+            text.text = "word1     word2";
+        }
+        trace("{ \"type\": \"KeyDown\", \"key_code\": " + event.keyCode + " },")
+    }
+
+    private function mouseDown(event:MouseEvent):void {
+        trace("{ \"type\": \"MouseDown\", \"pos\": [" + event.stageX + ", " + event.stageY + "], \"btn\": \"Left\" },");
+    }
+
+    private function mouseUp(event:MouseEvent):void {
+        trace("{ \"type\": \"MouseUp\", \"pos\": [" + event.stageX + ", " + event.stageY + "], \"btn\": \"Left\" },");
+    }
+
+    private function mouseMove(event:MouseEvent):void {
+        trace("{ \"type\": \"MouseMove\", \"pos\": [" + event.stageX + ", " + event.stageY + "] },");
+    }
+
+    private function textInput(event:TextEvent):void {
+        if (event.text.search(/[0-9]/g) != -1) {
+            event.preventDefault();
+        }
+    }
+}
+}