Thank you for spending your time on trying to help me out again. I think I’ll let this one go. I’ll have to limit my work to changes in the space_sequencer.py UI file and sequencer.py operator file for this VSE improvement project: https://github.com/tin2tin/blender_vse_reworked
If you have some time on your hands and an interest in the VSE, we could use some help on improving the code suggestion for VSE - Reworked: https://github.com/samytichadou/blender_vse_reworked/issues
Some other links: Can we in collaboration produce a working suggestion for improving the user interface of the VSE?
And: https://blender.chat/channel/vse
Anyway, thank you for the help.