In order of severity:
- You could actually click on the textbox portion of a disabled textbox,
focus it, select text, input stuff, and commit, which would die
on the spot.
- The slider part had no visual indication that it's not interactable
anymore.
Rather than control the propagation of the value between the slider and
the textbox, add a property that controls the propagation of the value
between the bindables inside the form control to external bindables.
This will help alleviate issues where the external bindable update
incurs overheads due to having heavy change callbacks attached.