Highlighting preformatted text after tab

This is a test for http://bugs.webkit.org/show_bug.cgi?id=6043 Incorrect selection highlighting in pre-formatted text with tabs.

Instructions:

1. Click test 1. The entire word “highlighting” below should be highlighted.

    Buggy	highlighting

2. Click test 2. The words “buggy highlighting” below should be fully highlighted.

    Very buggy	highlighting

3. Click test 3. The words “buggy highlighting” below should be fully highlighted.

    Very buggy	highlighting

4. Click test 4. The words “buggy highlighting” below should be fully highlighted.

Even more buggy highlighting.