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
paneFolder.getControl().getShell().removeShellListener(shellListener);
        PresentationUtil.removeDragListener(paneFolder.getControl(),
                dragListener);
        PresentationUtil.removeDragListener(titleLabel, dragListener);
        systemMenuManager.dispose();
        systemMenuManager.removeAll();
        paneFolder.getControl().dispose();
        paneFolder = null;
        titleLabel.dispose();
        titleLabel = null;
        viewToolBar.dispose();
    }
    /* (non-Javadoc)
     * @see org.eclipse.ui.internal.skins.Presentation#setActive(boolean)
     */
    public void setActive(boolean isActive) {
        activeState = isActive;
        updateGradient();
    }
    /**
     * Return whether the window's shell is activated
     */
    boolean getShellActivated() {
        return shellActive;
    }
    /**
     * Returns the top level window.
     */
    public Window getWindow() {