[HTML] don't indent after DOCTYPE, add indentation tests #2473
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This PR adds some basic indentation tests for the HTML package, and prevents unexpected indentation from occurring after a
doctype
directive. This follows the PHP one, whereby we are only using the test file to make assertions about indentation, not scopes, to keep things simple. (IMO, it would be a fairly invasive style change to rework the existing syntax tests to also assert indentation doesn't change, so a separate test file keeps it neat and tidy.)EDIT: note that due to the presence of multi-line comments in the test file, we can only assert
reindent-unchanged
and notreindent-unindented
due to the defaultpreserveIndent
behavior as mentioned at sublimehq/sublime_text#1271 (comment)