09d2108bf5
Implementation of the transform action for grease pencil frames, which enables translating and scaling grease pencil frames in the dopesheet. This patch adds the following in the grease pencil API : - `move_frames` to move a set of frames given a map of key transformations (with overwrite), and - the structure `LayerTransformData` that stores in the layer runtime some useful data for the frames transformation. Co-authored-by: Falk David <falk@blender.org> Pull Request: https://projects.blender.org/blender/blender/pulls/110743