* Fix for PartialStyleSheet getting stuck in loop
Adds a clause for detecting `//` as a comment marker when working backwards through a file, preventing the parser from getting stuck when the comment starts at 1:1
* Modify change to detect start of file instead of skipping additional `/` characters now that we know the issue only occurs at offset 0.
Co-authored-by: Tyler McEnaney <tharbakim@hotmail.com>
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