Improving effect management
## Switch to white list instead of black list - [ ] Switch to white list (ME: would allow to check with tests if all effects are available, #1850) - [ ] Allow custom white lists - [ ] Allow disabling all white lists for testing / advanced users ## Add a link to the documentation for each effect - [x] Add link to online documentation in effects / compositions info For instance : https://docs.kdenlive.org/fr/effects_and_compositions/video_effects/alpha_mask_keying/rotoscoping.html
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