Gerrit: Refactor preparing the introduction of a hierarchical model.
Change model and dialog methods to use QModelIndex and remove obsolete methods. Split out method to populate a list of standard items from a change. Change GerritModel::itemForId() to recurse over the tree. Change-Id: I9393f498ffbdf63ba3ad78146d041bcda3835527 Reviewed-by: Orgad Shaneh <firstname.lastname@example.org>
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