Bug 69423 [Tasks] TVT3.0: Multiple Mnemonics in Tasks -> Sorting screen
From the main Workbench view, click the Task menu (drop down arrow) and select Sorting. There are duplicated mnemonics for (D) and (A). See the attached screenshot.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/TableSortDialog.java
GridData data = new GridData();
        data.horizontalSpan = 3;
        sortByLabel.setLayoutData(data);
        for (int i = 0; i < priorityCombos.length; i++) {
            final int index = i;
            Label numberLabel = new Label(prioritiesArea, SWT.NULL);
            numberLabel
                    .setText(Messages
                            .format(
                                    "sortDialog.columnLabel", new Object[] { new Integer(i + 1) })); 
            priorityCombos[i] = new Combo(prioritiesArea, SWT.READ_ONLY);
            priorityCombos[i].setLayoutData(new GridData(
                    GridData.FILL_HORIZONTAL));
            Composite directionGroup = new Composite(prioritiesArea, SWT.NONE);
            directionGroup.setLayout(new GridLayout(2, false));
            ascendingButtons[i] = new Button(directionGroup, SWT.RADIO);
            ascendingButtons[i].setText(Messages
                    .getString("sortDirectionAscending.text")); 
            ascendingButtons[i].addSelectionListener(new SelectionAdapter() {
                public void widgetSelected(SelectionEvent e) {
                    markDirty();
                }
            });
            descendingButtons[i] = new Button(directionGroup, SWT.RADIO);
            descendingButtons[i].setText(Messages
                    .getString("sortDirectionDescending.text")); 
            descendingButtons[i].addSelectionListener(new SelectionAdapter() {
                public void widgetSelected(SelectionEvent e) {
                    markDirty();
                }