Bug 176158 Tool tip flickers
I20070227-0800 I'm using the new Tool tip support (org.eclipse.jface.window.ToolTip). The problem with this is that the tool tip flickers when the mouse is moved over an element. On mouse move the tool tip is hidden and then shown again. This makes the tool tip almost unusable. IMHO you should check that the mouse is still hovering over the same item and try to keep the visibility and position of the tooltip stable if so. I'll attach a little plugin showing the issue. Thanks
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/ColumnViewerToolTipSupport.java
private ColumnViewer viewer;
	private static final String LABEL_PROVIDER_KEY = Policy.JFACE
			+ "_LABEL_PROVIDER"; 
	private static final String ELEMENT_KEY = Policy.JFACE + "_ELEMENT_KEY"; 
	private static final int DEFAULT_SHIFT_X = 10;
	private static final int DEFAULT_SHIFT_Y = 0;
	/**
	 * Enable ToolTip support for the viewer by creating an instance from this
	 * class. To get all necessary informations this support class consults the
	 * {@link CellLabelProvider}.
	 * 
	 * @param viewer
	 *            the viewer the support is attached to
	 */
	protected ColumnViewerToolTipSupport(ColumnViewer viewer) {
		super(viewer.getControl());
		this.viewer = viewer;
	}
	/**
	 * Enable ToolTip support for the viewer by creating an instance from this
	 * class. To get all necessary informations this support class consults the
	 * {@link CellLabelProvider}.
	 * 
	 * @param viewer
	 *            the viewer the support is attached to
	 */