Bug 48452 Widget is disposed while closing cool bar
This is the problem that is occurring in the nightly builds. There is something happening where a cool bar is attempting to layout disposed cool bar items.
bundles/org.eclipse.jface/src/org/eclipse/jface/action/ToolBarContributionItem.java
}else {
					setVisible(true);
					if (getParent() != null) {
						getParent().markDirty();
					}
				}
			}
			
		}
	}
	/**
	 * Returns the minimum number of tool items to show in the cool item.
	 * 
	 * @return the minimum number of tool items to show,
	 * or <code>SHOW_ALL_ITEMS</code> if a value was not set
	 * @see #setMinimumItemsToShow(int)
	 */
	public int getMinimumItemsToShow() {
		return minimumItemsToShow;
	}
	/**
	 * Sets the minimum number of tool items to show in the cool item. If this number is less
	 * than the total tool items, a chevron will appear and the hidden tool items appear in a 
	 * drop down menu. By default, all the tool items are shown in the cool item.
	 * 
	 * @param minimumItemsToShow the minimum number of tool items to show. 
	 * @see #getMinimumItemsToShow()
	 * @see #setUseChevron(boolean)
	 */
	public void setMinimumItemsToShow(int minimumItemsToShow) {