Remove filtered items from the model if their parent folder is collapsed

Review Request #109343 - Created March 7, 2013 and submitted - Latest diff uploaded

Information
Frank Reininghaus
kde-baseapps
KDE/4.10
316335
Reviewers
dolphin
Very similar to https://git.reviewboard.kde.org/r/108976/. Basically, the same problem that happens when deleting expanded folders with hidden children is also there when collapsing the expanded folder.

The fix is the same. I mostly copied the code from slotItemsDeleted() to setExpanded(), rather than factoring it out, to make merging into master easier.
Works for me, old and new unit tests pass.
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