+ Actions: deselect unaffected items when running action to split items
Agreed with Sexan that selection should stay accordingly action name.
I wrote in one of previous dev threads:
If action split and select right, then items ended left of split point should be deselected.
If action split and select left, then items started right of split point should be deselected.
Such items could be concidered as forgotten after previous actions.
But not all unaffected items.
It's apparently more common use case. And it's closer to the current behavior existed for years.
Also I found some bugs:
1. Regular grouping breaks auto grouping.
2. There is some randomness in regular grouped items while I select them by mouse.