TabBarIndicatorSize
        Inherits: Enum
Defines how the bounds of the selected tab indicator are computed.
Properties
- 
          LABEL–The tab's bounds are only as wide as the (centered) tab widget itself. 
- 
          TAB–The tab indicator's bounds are as wide as the space occupied by the tab 
Properties#
LABEL = 'label'
  
      class-attribute
      instance-attribute
  
#
    The tab's bounds are only as wide as the (centered) tab widget itself.
This value is used to align the tab's label, typically a [Tab] widget's text or icon, with the selected tab indicator.
TAB = 'tab'
  
      class-attribute
      instance-attribute
  
#
    The tab indicator's bounds are as wide as the space occupied by the tab in the tab bar: from the right edge of the previous tab to the left edge of the next tab.