Bug 8280 Package view back/forward/up arrow hover help
Start up Eclipse with some existing Java Projects in the workspace. Select a package in one of these projects. Right-click and select Go Into. Hover over the Back arrow. Notice that a very tall tool-tip (full screen height) text appears, the first line being "Back to Java Model" and the remaining lines being package names (?). Immediately after being displayed, the tool-tip text disappears. The text will flash into and out of existance consitently until the pointer leaves the button's frame. The same behaviour can occur when hovering over the Up arrow or the Forward arrow when these lead to the workspace root.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/JavaElementLabelProvider.java
/**
	 * Flag (bit mask) indicating that method label include method parameter types.
	 */
	public final static int SHOW_PARAMETERS=				0x002;
	
	/**
	 * Flag (bit mask) indicating that the label of a member should include the container.
	 * For example, include the name of the type enclosing a field.
	 * @deprecated Use SHOW_QUALIFIED or SHOW_ROOT instead
	 */
	public final static int SHOW_CONTAINER=				0x004;
	/**
	 * Flag (bit mask) indicating that the label of a type should be fully qualified.
	 * For example, include the fully qualified name of the type enclosing a type.
	 * @deprecated Use SHOW_QUALIFIED instead
	 */
	public final static int SHOW_CONTAINER_QUALIFICATION=	0x008;
	/**
	 * Flag (bit mask) indicating that the label should include overlay icons
	 * for element type and modifiers.
	 */
	public final static int SHOW_OVERLAY_ICONS=			0x010;
	/**
	 * Flag (bit mask) indicating thata field label should include the declared type.
	 */
	public final static int SHOW_TYPE=					0x020;
	/**
	 * Flag (bit mask) indicating that the label should include the name of the
	 * package fragment root (appended).