I can't see the mouse wheel ever setting dx, but it's more obvious now that the editor doesn't support panning left/right.
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else
elseif dy < 0 then
function run.mouse_wheel_move(x,y)
function run.mouse_wheel_move(dx,dy)
return edit.mouse_wheel_move(Editor_state, x,y)
return edit.mouse_wheel_move(Editor_state, dx,dy)