Bug 56818 [PropertiesView] Clicking on Advanced Properties toggle when categories are collapsed removes the + next to the category
Clicking on Advanced Properties toggle when categories are collapsed removes the plus sign (+) next to the category and it can no longer be expanded. To reproduce: 1.)Open the Properties view. 2.)Have Show Categories turned on, and Show Advanced Properties turned off. 3.)Collapse all open categories. 4.)Click the Show Advanced Properties button. 5.)Note the plus sign goes away and the categories can no longer be expanded. You need to click the Show Advanced Properties button off to see the plus sign again.
bundles/org.eclipse.ui.views/src/org/eclipse/ui/views/properties/PropertySheetViewer.java
setInput(getInput());
			}
		});
	}
	/**
	 * Updates all of the items in the tree.
	 * <p>
	 * Note that this means ensuring that the tree items reflect the state of
	 * the model (entry tree) it does not mean telling the model to update
	 * itself.
	 * </p>
	 */
	public void refresh() {
		if (rootEntry != null) {
			updateChildrenOf(rootEntry, tableTree);
		}
	}
	/**
	 * Removes the given cell editor activation listener from this viewer. Has
	 * no effect if an identical activation listener is not registered.
	 * 
	 * @param listener
	 *            a cell editor activation listener
	 */
	
	void removeActivationListener(ICellEditorActivationListener listener) {
		activationListeners.remove(listener);
	}
	/**