app: ensure we do not keep references to a SourceWidget that has been deleted #887
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We previously were keeping references to pyqt Python wrapper objects that had their corresponding C++ objects deleted. This means that if we call any qt method on the Python object, we'd get a RuntimeError indicating that the underlying object is gone. We should ensure that we remove references to the Python wrapper object, so that we do not cause the aforementioned RuntimeError (which crashes the application) and/or prevent these wrapper objects from getting garbage collected as usual by cpython.
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Description
Fixes #880
Test Plan
This is a rare crasher, so you're going to need to verify that the following logic is sound:
SourceListvia itsupdatemethodChecklist
If these changes modify code paths involving cryptography, the opening of files in VMs or network (via the RPC service) traffic, Qubes testing in the staging environment is required. For fine tuning of the graphical user interface, testing in any environment in Qubes is required. Please check as applicable:
If these changes add or remove files other than client code, packaging logic (e.g., the AppArmor profile) may need to be updated. Please check as applicable: