Prevent props keys from being prefixed with #

Closes #3515500

added 7 commits

• 32143792...0d3fa144 - 5 commits from branch project:2.0.x
• ebe25e43 - Prevent props keys from being prefixed with #
• 8a0d2f2c - Issue #3515500 by kensae, pdureau, grimreaper: Add failing test first.

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added 1 commit

• eae51910 - Issue #3515500 by kensae, grimreaper, pdureau: Update logic from #3505217

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added 1 commit

• b4d78ef0 - Issue #3515500 by kensae, grimreaper, pdureau: Update logic from #3505217

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added 8 commits

• b4d78ef0...5c0b47e9 - 3 commits from branch project:2.0.x
• 60c72acc - Prevent props keys from being prefixed with #
• fa550a71 - Issue #3515500 by kensae, pdureau, grimreaper: Add failing test first.
• c89bc9f3 - Issue #3515500 by kensae, grimreaper, pdureau: Update logic from #3505217
• 5efdb89e - Issue #3515500 by kensae, grimreaper, pdureau: Update logic from #3505217
• 271165fa - Issue #3515500 by grimreaper, kensae, pdureau: Add theme layout case. Handle mixed syntax.

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added 1 commit

• e233f82b - Issue #3515500 by grimreaper, kensae, pdureau: Fix PHPMD

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added 1 commit

• a1d9c246 - Issue #3515500 by grimreaper, kensae, pdureau: Fix CI

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merged