Fix PyQt5 checkStateChanged AttributeError on QCheckBox#1479
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Description
Recent updates to
QCheckBoxsignals ingui.pymigratedstateChangedtocheckStateChanged. While this correctly aligns with PyQt6, it breaks compatibility withPyQt5andPySide2wherecheckStateChangeddoes not exist onQCheckBox, causing anAttributeErrorupon starting the GUI.Solution
This PR adds a simple
try-except AttributeErrorfallback that attempts to connectcheckStateChanged(for PyQt6 / PySide6) and gracefully falls back tostateChanged(for PyQt5 / PySide2), ensuring Cellpose's GUI remains compatible across older Conda environments.