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If the resetting behaviour is wrong, make sure it's been reported as an issue in the issue tracker (maybe after checking that it's not already listed in the Known Issues list in the release notes).
As for zoomToRect(), since it's not marked Q_INVOKABLE, I can't see any way you'd be able to call it directly from QML. Instead, perhaps just as a stopgap define a slot in your C++ launcher code, as a wrapper for that routine, letting the QML pass in appropriate arguments.
