Plasma Theme missing properly PartiallyChecked state

[psifidotos]

Using Figure A all three states of a Plasma Theme Checkbox are shown. Option "Always use floating gap for user interaction" is using a PartiallyChecked state. Maybe a much better metaphor can be used like in Figure B or C.

Figure A:

Figure B:

Figure C:

[varlesh]

I'm not found info about checkbox on tutorial:
https://techbase.kde.org/Development/Tutorials/Plasma5/ThemeDetails#Current_Theme_Elements
As i know used widget checkmarks with ID checkbox and have only one state on Breeze theme too...