Split State Indicates whether the pane has horizontal / vertical splits, and whether those splits are frozen. Options are
* frozen: Panes are frozen, but were not split being frozen. In this state, when the panes are unfrozen again, a single pane results, with no split. In this state, the split bars are not adjustable. * frozen_split: Panes are frozen and were split before being frozen. In this state, when the panes are unfrozen again, the split remains, but is adjustable. * split: Panes are split, but not frozen. In this state, the split bars are adjustable by the user.