Squash collection shares

If folder1 is shared to user2 and user3. And folder1/folder2 is shared
to user4 and user5 then getting all the users with access to
folder1/folder2 should only list user2 and user 3 once.

Previously this was done twice since we request the info two times.

This fix makes sure that we only append unique results to the array.

* Added test

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/private/share/share.php b/lib/private/share/share.php
index 932586b5c27..aafaeca9768 100644
--- a/lib/private/share/share.php
+++ b/lib/private/share/share.php
@@ -1914,6 +1914,7 @@ class Share extends Constants {
 				}
 			}
 			if (!empty($collectionItems)) {
+				$collectionItems = array_unique($collectionItems, SORT_REGULAR);
 				$items = array_merge($items, $collectionItems);
 			}