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Avoid caching QModelIndexes

David Edmundson requested to merge work/crash_fix into master

QModelIndexes can go out of date with no change notifications.

What we were seeing in the applications side bar is that the filter of PIDs would change which effectively removes and replaces every delegate.

Delegates get re-used, if one is re-used at the same row and column the modelIndex is not updated, however the internalId is completely wrong. Having valid numbers and parents and wrong internalIds is an absolute recipe for disaster!

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