Fix JavaKeywordsDemo comment pattern #972
Merged
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Fixes #970
The JavaKeywordsDemo was recently updated with a way to only compute highlighting on the visible paragraphs instead of on the whole contents of the editor. However the regular expression pattern for comments was originally designed to work on a block of text and not lines of text, which is why the multi-line comments aren't being correctly styled (when using the visible paragraphs highlighting method).
This PR updates the COMMENT_PATTERN to address this, although it's not perfect.