We have just migrated code from using PyQt-4.2 on Qt-4.2 to using
PyQt-4.2 on Qt-4.2. This has revealed what looks like a very serious bug
in the signal handling code for PyQt-4.2.
We have Python "value" objects derived from QObject. These emit a value
change event to other values and to listening QWidget derived objects.
After a short (yet non-repeatable) series of actions, the signal
callbacks will no longer be called. We can confirm that the objects on
both sides are still valid.
We are not ruling out a problem on our end yet. Again, this works
without error on 4.1.1, but will always fail with 4.2. The thing that
makes this tricky is there is no purely repeatable way to trigger the
problem. But it always happens within a small number of steps.
The layers of code also make this difficult to reduce to a minimal test
case. I know that would largely help this get tracked down, but I am
coming here to look for solutions early.
Has anyone else reported similar problems on 4.2? Are there any simple
tests we could run in the meantime to help narrow this down?
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