Fix: not detecting tabs as a valid seperation between tags.

[ethan-vanderheijden]

Resolves: #812

• [x] Added tests for changed code.

It wasn't detecting tabs as a valid whitespace between HTML tags, causing it to transform: <div>\n\t<p></p>\n</div> into: <div>\n\t\n<p></p>\n</div>

Notice that the transformed text has an extra new line after the tab character. Normally extra new lines are removed, but with --preserve-blank-lines, this extra new line persists.

Note:

• --preserve-blank-lines and --max-blank-lines are incompatible with each other (I think this was true before my PR). Since --max-blank-lines preserves blank lines as well, it would make a lot of sense to combine the two options into one.

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[monosans]

Thank you!