Improve error range for ETagUnterminated

[angelozerr]

Given this XML file:

<?xml version='1.0' encoding='UTF-8'?>
<project>
  <dependencies>
    <dependency>
      <scope>test</scope>
    </dependency
    <dependency>
      <scope>test</scope>
    </dependency>
  </dependencies>
</project>

The error highlight scope element:

although it should higlight the dependency element like:

Another usecase:

<foo>
  <ba><ABCD></ABCD></bar>
</foo>

bar should be highlighted, but we have that:

[fbricon]

Weird, cause it works in other cases

[angelozerr]

Weird, cause it works in other cases

Yes I know, we support error range for ETagUnterminated, but there are some usecases (described in the issue) which doesn't work. I started to investigate the problem, hope I could create a PR soon.