Following the feature freeze during the Beta stage, this RC focuses mainly on stability, performance, and polish.
Out of 334 pull requests, 265 have been merged into the Joomla 6.0 core. Some of the key highlights include:
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Child template support for Cassiopeia
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Improved content versioning (track and restore changes more efficiently)
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New Date / Datetime field types
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Mass tag deletion option
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File thumbnails in Media Manager for any file type
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Language cache improvements for faster performance
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New Task Runner for background jobs
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Backward compatibility plugin to ease migration from previous versions
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Extensive code cleanup and dependency updates
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TinyMCE 8.0.1 integration
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Dozens of UI/UX refinements and bug fixes
This update represents a major modernization step for Joomla’s backend and developer framework while maintaining backward compatibility wherever possible.