P: Moving AI masks "Feather" or "Edge" sliders records a history step EVEN when no change is done.

Steps to Reproduce: 

1. Select an Ai mask

2. Move any of the Refinements sliders from form the current value to another one and back to the current value but NEVER releasing the slider.

Actual Result: A step is recorded in history but nothing changed from step 1 and step 2, the value chosen in UI is the same.

Expected Result: Moving AI masks "Feather" or "Edge" sliders DOES NOT record an history step when the UI value is the same as before.

Addendum: There is floating point difference in the values when moving a slider back and forth to the same value but it should not matter.