DESCRIPTION
One issue of the current camera system is that the camera is always rotated around the global gravity direction. It's not convenient when you want to edit shapes in its own space (e.g., editing points in a rotated Bezier shape or editing strokes in a rotated object).
Therefore, I added a new camera button besides the recenter camera button to reorient the camera to the local coordinate of the selected stroke/object. Then the rotation/panning of the camera will all be operated in the local space.
You can click the button again to switch back to the global space.