Project: SWT
Bug 403346 TreeViewers throw NPE's on collapsed multi-selections
Reported: 2013-03-14 10:34:22 | Status: resolved fixed

If you select multiple elements in the Package Explorer and then collapse the tree using the *toolbar button* (not the + on the tree itself) then you will start seeing multiple NPEs reported. Changing the selection in the tree causes the problem to go away.

Files changed in fix:
bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/widgets/Tree.java