tests: Add avm2/edittext_set_text_vs_html test

This test verifies the behavior of htmlText vs text setters and
how they set the HTML bit.

tests/tests/swfs/avm2/edittext_set_text_vs_html/Test.as

@@ -0,0 +1,32 @@
+package {
+import flash.display.*;
+import flash.text.*;
+import flash.events.*;
+import flash.geom.*;
+
+public class Test extends MovieClip {
+    public function Test() {
+        var tf = new TextField();
+        tf.defaultTextFormat = new TextFormat("Default Font");
+        tf.defaultTextFormat = new TextFormat("Default Font");
+
+        tf.htmlText = "<font face='NonDefault Font'><b>bold</b></font>";
+
+        trace("After setting HTML:");
+        trace("  " + tf.text);
+        trace("  " + tf.htmlText);
+
+        tf.text = "text";
+
+        trace("After setting text:");
+        trace("  " + tf.text);
+        trace("  " + tf.htmlText);
+
+        tf.text = "<b>text</b>";
+
+        trace("After setting text with HTML entities:");
+        trace("  " + tf.text);
+        trace("  " + tf.htmlText);
+    }
+}
+}

tests/tests/swfs/avm2/edittext_set_text_vs_html/output.txt

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+After setting HTML:
+  bold
+  <P ALIGN="LEFT"><FONT FACE="NonDefault Font" SIZE="12" COLOR="#000000" LETTERSPACING="0" KERNING="0"><B>bold</B></FONT></P>
+After setting text:
+  text
+  <P ALIGN="LEFT"><FONT FACE="Default Font" SIZE="12" COLOR="#000000" LETTERSPACING="0" KERNING="0">text</FONT></P>
+After setting text with HTML entities:
+  <b>text</b>
+  <P ALIGN="LEFT"><FONT FACE="Default Font" SIZE="12" COLOR="#000000" LETTERSPACING="0" KERNING="0">&lt;b&gt;text&lt;/b&gt;</FONT></P>

tests/tests/swfs/avm2/edittext_set_text_vs_html/test.toml

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+num_ticks = 1