[518968] Only traverse and cache necessary Papyrus tree items

Avoid traversing and caching the entire Papyrus content tree when
determining the item to be selected:
- Use incremental computation and caching of Papyrus tree items

Bug: 518968
Change-Id: I4ac04d252747600b48d01e3b6232200e5ce4fa51
Signed-off-by: Martin Fleck <mfleck@eclipsesource.com>
1 file changed