Returns the amount, in pixels, of extra indentation for child levels in @tree_view.
Return: the amount of extra indentation for child levels in @tree_view. A return value of 0 means that this feature is disabled.
2.12
See Implementation
Returns the amount, in pixels, of extra indentation for child levels in @tree_view.
Return: the amount of extra indentation for child levels in @tree_view. A return value of 0 means that this feature is disabled.