tests: Add avm2/edittext_set_html_same test

This test verifies the behavior of htmlText when
setting to the same value.

tests/tests/swfs/avm2/edittext_set_html_same/Test.as

@@ -0,0 +1,36 @@
+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.multiline = true;
+        tf.defaultTextFormat = new TextFormat("Unknown Font");
+        tf.htmlText = "<p align=\"center\">x</p>";
+
+        trace("Before newline removal:");
+        trace("  " + tf.text.length);
+
+        tf.replaceText(1, 2, "");
+
+        trace("After newline removal:");
+        trace("  " + tf.text.length);
+        trace("  " + tf.htmlText);
+
+        tf.htmlText = "<P ALIGN=\"CENTER\"><FONT FACE=\"Unknown Font\" SIZE=\"12\" COLOR=\"#000000\" LETTERSPACING=\"0\" KERNING=\"0\">x</FONT></P>";
+
+        trace("After setting to the same value:");
+        trace("  " + tf.text.length);
+        trace("  " + tf.htmlText);
+
+        tf.htmlText = "<P  ALIGN=\"CENTER\"><FONT FACE=\"Unknown Font\" SIZE=\"12\" COLOR=\"#000000\" LETTERSPACING=\"0\" KERNING=\"0\">x</FONT></P>";
+
+        trace("After setting to a slightly different value:");
+        trace("  " + tf.text.length);
+        trace("  " + tf.htmlText);
+    }
+}
+}

tests/tests/swfs/avm2/edittext_set_html_same/output.txt

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+Before newline removal:
+  2
+After newline removal:
+  1
+  <P ALIGN="CENTER"><FONT FACE="Unknown Font" SIZE="12" COLOR="#000000" LETTERSPACING="0" KERNING="0">x</FONT></P>
+After setting to the same value:
+  1
+  <P ALIGN="CENTER"><FONT FACE="Unknown Font" SIZE="12" COLOR="#000000" LETTERSPACING="0" KERNING="0">x</FONT></P>
+After setting to a slightly different value:
+  2
+  <P ALIGN="CENTER"><FONT FACE="Unknown Font" SIZE="12" COLOR="#000000" LETTERSPACING="0" KERNING="0">x</FONT></P>

tests/tests/swfs/avm2/edittext_set_html_same/test.toml

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+num_ticks = 1