QmlDesigner: Remove NavigatorTreeModel::containsNode

Use NavigatorTreeModel::isInTree instead

Change-Id: I5bdfdef0c668addf5252bd5c1d3c0772fe092a62
Reviewed-by: Marco Bubke <marco.bubke@digia.com>
QmlDesigner: Remove double check

Change-Id: I69afdb4e8bc08e6f13951f0dc3b7e3526d115e9a
Reviewed-by: Marco Bubke <marco.bubke@digia.com>
QmlDesigner: remove nodeForHash

Change-Id: Id56c5347c2ad72498b29dab0c4897f115919582b
Reviewed-by: Marco Bubke <marco.bubke@digia.com>
QmlDesigner: Fix short name in NavigatorTreeModel::moveNodesInteractive

Change-Id: Ib04319f44f28c06b6af1cac4a70958ce474318db
Reviewed-by: Marco Bubke <marco.bubke@digia.com>
QmlDesigner: Refactor NavigatorTreeModel::removeSubTree

Change-Id: Ibed59ae8a9e84030c4ca303760ed939b021ec4cb
Reviewed-by: Marco Bubke <marco.bubke@digia.com>