Disabled ttk::checkbutton doesn't show the state of associated variable, when using "alt" theme.
Cause of problem: the color palette computation for IndicatorElements (based on TIP#109 implementation) was wrong. Fixed in CVS: disabled+selected is now visually distinct from disabled+!selected; in addition, check/radiobutton indicators now look like Windows 98 as intended.
please backport fix for 8.5.9
Fixed in CVS. Closed. Please leave closed.