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It is very nice to have Matisse being able to integrate self-designed UI Elements into its Palette. It would be even better, if there could be some kind of support to do this project-specific, e.g. define some palette enhancements in project file or by annotation which get added to Matisse Palette when the project is opened and removed if the project is closed. Of course, the referenced Files (classes or jars) should stay in the Project as well or be defined as some kind of project dependency.
See also issue 161191.