Improve recognition of generated, source-mapped files #4661
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Description
Fixes #4659 by testing for CSS
sourceMapURL
pragmas, which Linguist ignores altogether (though it has absolutely no reason to).I've also tightened the current logic to support an alternative syntax the Source-Map V3 spec explains was in-use at one point, but now discouraged (emphasis mine):
Checklist:
/cc @hvaoc @lildude