The transformation code is old and includes many features that have been added over time.
Large cleanups with file splitting have improved the organization and readability of the code. But there are still other important steps to take.
The objective of this task is to organize everything that needs to be improved in the transform code.
- T69818: Transform: Rethink the flags used in 't->flag'
- Rename functions to better indicate which ones are callbacks
- Add a relative mirror option for mesh editing (similar to bones). This would solve problems like T74340