Song Editor: Total displacement with Mouse Wheel + Mouse

This is not an error but a feature that LMMS needs, when you have many tracks and you have the editors loaded you need mobility, now I use the scroll bars, the zoom and the shift key + mouse wheel to move, but they are not versatile.
A solution can be by pressing the mouse wheel key + mouse giving a vertical and horizontal scrolling on all sides as it does '' carla '' or other editing programs when you press the key of the mouse wheel.

Start by locating the Song Editor's mouse-wheel, middle-mouse, and scrollbar handling, then compare the existing zoom and Shift+mouse-wheel behavior. Done means middle-mouse interaction supports vertical and horizontal navigation across the editor, including projects with many tracks and loaded editors; verify the behavior manually.

Written by the indexing model from the issue text.