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Daniel Vrátil authored
When populating Collections in ETM we may receive a "Collection added" notification. If the Collection doesn't belong to an already-populated subtree the code in ETMPrivate::retrieveAncestors() will try to iterate through the chain of parent Collections to figure out which Collections are missing and must be retrieved. However, Collections from the Monitor notifications have only one parent set (the ancestor chain is not complete) and so the code would get stuck. This change makes retrieveAncestors() to handle the situation gracefuly by fetching the entire ancestor chain from Akonadi recursively. This got discovered by etmpopulationtest where the monitor likely received a delayed notification that we sent during the initial population of Akonadi by Knut resources.