Bug 55895 import declarations are missing in quick outline
version: i2004-03-24 + plugin-export
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/JavaOutlineInformationControl.java
}
			}
			return super.getChildren(element);
		}
		
		/**
		 * {@inheritDoc}
		 */
		public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
			super.inputChanged(viewer, oldInput, newInput);
			fTypeHierarchies.clear();
		}
		
		/**
		 * {@inheritDoc}
		 */
		public void dispose() {
			super.dispose();
			fTypeHierarchies.clear();
		}
		
		/**
		 * Returns the primary type of a compilation unit (has the same
		 * name as the compilation unit).
		 * 
		 * @param compilationUnit the compilation unit
		 * @return returns the primary type of the compilation unit, or
		 * <code>null</code> if is does not have one
		 */
		private IType getMainType(ICompilationUnit compilationUnit) {