The official gui for Sigil under Qt6 is not PyQt6 but instead Qt's official PySide6. DiapDealer has created a plugin_utils.py module to make supporting PyQt5 and PySide6 easily done. He also has a plugib_utils_light.py module for use with Sigil 2.0.0 or later versions of Sigil.
Integrating one of those two modules into this plugin would definitely be useful to others.
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