tmux.WindowOptionValues.PaneColours

PaneColours returns materialized "pane-colours" as OptionValue with value type OptionValue[SparseArraystring] from window option values; it does not query tmux. Available as COLOUR since tmux 3.3; set it with Window.SetPaneColours or GlobalWindowScope.SetPaneColours . Its present SparseArray value preserves assigned tmux indexes, including gaps.