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App with multiple ImageWidgets seg faults about 40+% of the time on startup #107

Description

@RussBerg

The only error produced is:
**_

Process finished with exit code -1073741819 (0xC0000005)

_**
tracing this it appears to be a result of calling QApplication.ProcessEvents() in xcsw_is_visible()
I see the note in SubplotWidget class :

# FIXME: Part of this class should be refactored with BaseImageWidget (at least
# the methods add_standard_panels, adjust_ycsw_height and xcsw_is_visible).
# This will be done in plotpy (the library replacing guiqwt at the end of 2023).

So this will likely be addressed then but would be good to have a workaround until then

System this occurred on:
Windows: 10
python: 3.9
guidata: 2.3.0
guiqwt: 4.3.3
pyQt5: 5.15.6

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