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
bgPercents = R21Colors.getActiveViewGradientPercents();
            } else {
                fgColor = R21Colors
                        .getSystemColor(SWT.COLOR_TITLE_INACTIVE_FOREGROUND);
                bgColors = R21Colors.getDeactivatedViewGradient();
                bgPercents = R21Colors.getDeactivatedViewGradientPercents();
            }
        } else {
            fgColor = R21Colors.getSystemColor(SWT.COLOR_LIST_FOREGROUND);
            bgColors = null;
            bgPercents = null;
        }
        drawGradient(fgColor, bgColors, bgPercents, vertical);