Contrary to the initial intention (in rB9916e0193c36), `TREDRAW_SOFT` flag, when isolated, is not cleared in `transformApply` and therefore is used in the `drawTransformApply` callback which basically recalculates the `transformation` which finally clears the flag. So remove the `drawTransformApply` callback so `transformApply` is not called when unnecessary. Differential Revision: https://developer.blender.org/D14430