Check style in active filter when style combo is open.
Check activeFilter on open in format plugin.
Add onStateUpdate method.
Check active filter in font plugin.
Call onStateUpdate also from button plugin.
Check active filter in color button plugin.
Call onStateUpdate after setState.
Check active filter in language plugin.
Check if feature is available  in indent plugin.
Move checking if style is applicable from stylecombo.onOpen to style.checkApplicable.
getState method. Disable styles and format when not active.
Update state in rich combo on selection change.
Check if elementPath exists in onStateUpdate in stylecombo and format plugins.