Bug 22274 [DND] Navigator should not sync selection with editor on drag
If I have two resources A and B open in their editors, and I try to drag A into B from the navigator view, I cannot. The navigator will flip the active active editor to A, making it impossible to drop on B. It is possible to avoid this by checking the dragsourceevent.doit value during the dragStart callback, and storing this value until the drag finished callback has occurred. If it is true, then a native drag is about to start. The mousedown or selection event should come after the dragStart event, and "Link navigator selection to active Editor" can be suppressed.
bundles/org.eclipse.ui.views/src/org/eclipse/ui/views/navigator/ResourceNavigator.java
String element = (String) iter.next();
					if (!selectedFilters.contains(element) && !unSelectedFilters.contains(element))
						selectedFilters.add(element);
				}
				
				
				String[] patternArray = new String[selectedFilters.size()];
				selectedFilters.toArray(patternArray);
				getPatternFilter().setPatterns(patternArray);
				
			} else {  
				String filters[] = new String[children.length];
				for (int i = 0; i < children.length; i++) {
					filters[i] = children[i].getString(TAG_ELEMENT);
				}
				getPatternFilter().setPatterns(filters);	
			}			
		} else {  
			getPatternFilter().setPatterns(new String[0]);
		}
	}
	/**
	 * Restores the state of the receiver to the state described in the specified memento.
	 *
	 * @param memento the memento
	 * @since 2.0
	 */
	protected void restoreState(IMemento memento) {
		TreeViewer viewer = getTreeViewer();
		IMemento frameMemento = memento.getChild(TAG_CURRENT_FRAME);