Bug 197113 Project Explorer drag and drop selection not working properly
Create a new java project. Open Project Explorer. Create 2 new classes - Test1 and Test2. Close the java code editors. Select Test1.java in the project explorer. Select Test2.java by doing a mouse down only (so Test1.java still appears highlighted) then drag Test2.java into the code editor area ()- Test1.java is displayed. This only occurs in the Project Explorer, the package explorer works fine.
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/navigator/CommonViewer.java
}
			} else {
				super.update(element, properties);
			}
		} else {
			super.update(element, properties);
		}
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see java.lang.Object#toString()
	 */
	public String toString() {
		return contentService.toString() + " Viewer"; 
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.viewers.AbstractTreeViewer#internalRefresh(java.lang.Object,
	 *      boolean)
	 */
	protected void internalRefresh(Object element, boolean updateLabels) {
		if (element == null && getRoot() == null) {
			return;
		}
		super.internalRefresh(element, updateLabels);
	}
}