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Fix OpacityWidget Range bug

Mathieu Westphal (Kitware) requested to merge mwestphal/paraview:FixRangeWidgetBug into master

Fix a bug with the OpacityWidget when the range was changing.

When the range was changing from a high minimum to a low maximum a bug could happen where the min was not correctly set and the opacity widget became white. This fixes it and adds a test for it.

In order to test the OpacityWidget, it is needed to add support for testing any QVTKOpenGL*Widget, this also adds it.

Fix #19090 (closed)

Edited by Joachim Pouderoux

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