XmlParsing issue

The xml parser detects the issue, but throws the error on the first line instead of the actual location.

it.only('flags missing closing tag', () => {
    program.setFile<XmlFile>(`components/app.xml`, trim`
    <?xml version="1.0" encoding="utf-8" ?>
        <component name="BaseScene" extends="Scene">
        <children>
            <LayoutGroup>
            <LayoutGroup/> <!--oops, it should have been </LayoutGroup> -->
        </children>
        </component>
    `);
    program.validate();
    expectDiagnostics(program, [{
        message: 'Syntax error',
        range: util.createRange(4, 20, 4, 33)
    }]);
});

Start from the inline test for “flags missing closing tag,” especially the XmlFile setup and program.validate() call. Trace the XML parser’s diagnostic location handling and make the reported range point to the mismatched tag on line 4 rather than the first line. Run the test and confirm the expected range and “Syntax error” diagnostic pass.