Please Reopen 26951 & 26966

When I submit these exceptions your exception reporter tells me that they
are both fixed in build 253.  The thing is I just installed build 253 and
they are still happening.  Thanks!

Here's how to repro these bugs
1. Create a new ASPX file bug.aspx with a code behind file bug.aspx.cs.
2. Set the content to:
<%@ Page language="c#" Inherits="bug" ContentType="text/javascript"
CodeFile="bug.aspx.cs" %>

function foo() {
    var x = 1;
}

3. Now start editing this file.  Add some javascript, edit methods, select
text/copy/cut/paste, etc etc.

You should get both of these exceptions, 26966 and then 26951 in that order
once the errors show up.