PySide6 on Linux: segfault in test_colormap_editor.py

[PierreRaybaut]

This is due to the implementation of the external module sliders.

In _GenericSlider and _GenericRangeSlider, the QAbstractSlider signals valueChanged, sliderMoved and rangeChanged are overriden by instance attributes of thoses classes. This is apparently tolerated by PyQt5 but absolutely not by PySide6 and leads to a segmentation fault.

():~/PlotPy$ python plotpy/tests/features/test_colormap_editor.py
Initialization of a default colormap editor widget
Initialization of a new colormap editor with the previous colormap:  ((0.0, '#0000ff'), (0.5, '#ff0000'), (1.0, '#ffff00'))
((0.0, '#0000ff'), (0.5, '#ff0000'), (1.0, '#ffff00'))
Initialization of a new default colormap editor, modified post-initialization with the previous colormap:  ((0.0, '#0000ff'), (0.5, '#ff0000'), (1.0, '#ffff00'))
Initialization of a new default colormap editor, modified post-initialization with the previous colormap with stops scaled by 255 + 1:  ((1, '#0000ff'), (128, '#ff0000'), (256, '#ffff00'))
Initialization of a new default colormap editor, modified post-initialization with the previous colormap where the red stop is replaced with a green stop:  ((1, '#0000ff'), (128, '#ff0000'), (256, '#ffff00'))
Segmentation fault