In #11909 we added a lineRender hack from https://codemirror.net/demo/indentwrap.html. This hack alone works fine for files using spaces as whitespace. However, the PR was missing this additional hack from the pages stylesheet:

      .CodeMirror pre > * { text-indent: 0px; }

This PR adds that, thus fixing #11963

@abose @stowball @rroshan1

edit: Steps to repro:

1. Create new file foo.html
2. Set indentation to Tab size: 4 from Brackets
3. Write <h1>Foo</h1>
4. Try to indent it with by pressing tab
   -> Text doesn't move at all

After PR:

1. Create new file foo.html
2. Set indentation to Tab size: 4 from Brackets
3. Write <h1>Foo</h1>
4. Try to indent it with by pressing tab
   -> Tabs work as indented and the indent-wrap hack still works too