Bug 213166 [Viewers] Problems with OwnerDrawLabelProvider.setUpOwnerDraw
3.4 M4 To set up the owner draw callbacks for a viewer OwnerDrawLabelProvider.setUpOwnerDraw is offered. The problem of this is: a. there's no way to uninstall the callbacks. In our views we want to allow to enable and disable owner draw in the preferences b. from an API client perspective, it would be nicer if the label provider could install itself when installed. A good solution would be to add more life cycle to a label provider. CellLabelProvider.initialize(ColumnViewer, int column) There's already ILableProvider.dispose when a label provider is removed from a viewer.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/ContentViewer.java
}
    /**
     * Notifies that the label provider has changed.
     * <p>
     * The <code>ContentViewer</code> implementation of this method calls <code>refresh()</code>.
     * Subclasses may reimplement or extend.
     * </p>
     */
    protected void labelProviderChanged() {
        refresh();
    }
    /**
     * Sets the content provider used by this viewer.
     * <p>
     * The <code>ContentViewer</code> implementation of this method records the 
     * content provider in an internal state variable.
     * Overriding this method is generally not required; 
     * however, if overriding in a subclass,
     * <code>super.setContentProvider</code> must be invoked.
     * </p>
     *
     * @param contentProvider the content provider
     * @see #getContentProvider
     */
    public void setContentProvider(IContentProvider contentProvider) {
        Assert.isNotNull(contentProvider);
        IContentProvider oldContentProvider = this.contentProvider;
        this.contentProvider = contentProvider;
        if (oldContentProvider != null) {
            Object currentInput = getInput();