UI Bug: Apply Button not Applying (e.g., Sphere Source Radius)

Summary

The Apply button becomes clickable after a Source Sphere's radius is changed, but clicking Apply does not update the view. One must move the cursor to another text entry before the change is applied.

Steps to Reproduce

Launch ParaView 5.6.0 64-bit (macOS).
Sources -> Geometric Shapes -> SPhere
Click Apply (my default radius is set to 0.5).
Update radius to new value (e.g., 0.1). Apply becomes clickable.
The radius is not updated in the view.

Workaround

Update radius to new value (e.g., 0.1). Apply becomes clickable.
Select a new text entry (e.g., Theta Resolution).
Click Apply. The radius is updated.

CC. @patchett2002 @ethan.stam

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