Hi Jean-Baptiste, hi Vincent,on the basis of the timeline clip corner discussion I've managed to teach myself a few new tricks, or rather click and edit around satisfyingly. I've added a new timeline config UI option to choose between rounded and straight corners, with associated painting code for clips and transitions.
Since I don't know how to hand the changes over to you, I'm asking here; and I've send a pull request on github to the KDE/Kdenlive repository.
Best regards, Harald