Bug 69424 TVT3.0: Multiple Mnemonics in Tasks -> Filters
From the main Workbench view, click the Task menu (drop down arrow) and select Filters. There are duplicated mnemonics for (D). See the attached screenshot.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/DialogProblemFilter.java
org.eclipse.ui.views.markers.internal.DialogMarkerFilter {
    private DescriptionGroup descriptionGroup;
    private SeverityGroup severityGroup;
    private class DescriptionGroup {
        private Label descriptionLabel;
        private Combo combo;
        private Text description;
        private String contains = Messages.getString("filtersDialog.contains"); 
        private String doesNotContain = Messages