Fixed @left-* parsing

[Andarist]

fixes #341

[coveralls]

Pull Request Test Coverage Report for Build 12736556494

Details

• 6 of 6 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.01%) to 98.613%

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Totals
Change from base Build 10510962967:	0.01%
Covered Lines:	288
Relevant Lines:	291

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💛 - Coveralls

[Andarist]

this is a default case that's not the last one 😅 I tried to code-golf this as much as possible and this is my best version so far

I was testing the size increase on dist/umd/stylis.js (since it's already minified) using wc -c and gzip -c | wc -c. Those are results:

ref	wc -c	gzip -c | wc -c
master	10571	4396
9c57efb	10607	4413
2a519d3	10619	4409
ebd509a	10606	4406

[Andarist]

The idea behind the fix here is that for non-layer and non-container (this case was already covered) we "reset" offset. We do the same in the default case and that's why the code falls through from those when it doesn't break

Then based on the offset (if it survived or not) the correct parsing invocation is selected