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
* if there is no such tab
     */
    private final int indexOf(IPresentablePart part) {
        if (part == null) {
            return paneFolder.getItemCount();
        }
        CTabItem[] items = paneFolder.getItems();
        for (int idx = 0; idx < items.length; idx++) {
            IPresentablePart tabPart = getPartForTab(items[idx]);
            if (part == tabPart) {
                return idx;
            }
        }
        return items.length;
    }
    /**
     * Returns the tab for the given part, or null if there is no such tab
     * 
     * @param part the part being searched for
     * @return the tab for the given part, or null if there is no such tab
     */
    protected final CTabItem getTab(IPresentablePart part) {
        CTabItem[] items = paneFolder.getItems();
        int idx = indexOf(part);
        if (idx < items.length) {
            return items[idx];
        }
        return null;
    }
    /**