Replace duck-typing check with isinstance check for QRangeSlider #7712
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In #5757, we added a test for sliders in layer controls that checked for ranged
sliders by checking for the presence of a private attribute
_valuesChanged
.It's bad practice to check for private attributes in outside libraries. This
instead checks for the correct class in superqt.
See also: pyapp-kit/superqt#283