Bug 85774 [Presentations] bad tooltips in r21 presentation on Linux
The tooltips for the view menu and close buttons contain the "&" character on GTK.
bundles/org.eclipse.ui.presentations.r21/src/org/eclipse/ui/internal/presentations/R21BasicStackPresentation.java
*/
    protected void showListDefaultLocation() {
        R21PaneFolder tabFolder = getPaneFolder();
        Shell shell = tabFolder.getControl().getShell();
        Rectangle clientArea = tabFolder.getClientArea();
        Point location = tabFolder.getControl().getDisplay().map(
                tabFolder.getControl(), null, clientArea.x, clientArea.y);
        showList(shell, location.x, location.y);
    }
    void setSelection(CTabItem tabItem) {
        getSite().selectPart(getPartForTab(tabItem));
    }
    void close(IPresentablePart presentablePart) {
        getSite().close(new IPresentablePart[] { presentablePart });
    }
    Image getLabelImage(IPresentablePart presentablePart) {
        return presentablePart.getTitleImage();
    }
    String getLabelText(IPresentablePart presentablePart, boolean includePath) {
        String title = presentablePart.getTitle().trim();
        return title;
    }
    /* (non-Javadoc)
     * @see org.eclipse.ui.presentations.StackPresentation#setActive(int)
     */
    public void setActive(int newState) {
        setActive(newState == AS_ACTIVE_FOCUS);
    }
}