I can use the mouse wheel with Ctrl + Shift to either Change Frame (as is the default keybinding) or to Change Layer and it works as expected, but using Ctrl + Alt for those actions behaves inconsistently and seems to jump between frames/layers unpredictably.
Steps to recreate:
- Set “Change Layer” to both Mouse Wheel action “Ctrl + Alt” and “Ctrl + Shift”
- Create a new sprite
- Press Shift+N twice to create layers 2 and 3.
- Scroll with mouse wheel while holding Ctrl + Alt, it only changes between layers 2 and 3, while Ctrl + Shift changes between all three.
That’s it. If you create an additional layer #4 afterwards and try scrolling again, Ctrl+Alt will switch between #4 and #2 instead.
Version: Steam (tested on both Ubuntu and Windows)