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
.getString("filtersDialog.doesNotContain"); 
        public DescriptionGroup(Composite parent) {
            descriptionLabel = new Label(parent, SWT.NONE);
            descriptionLabel.setFont(parent.getFont());
            descriptionLabel.setText(Messages
                    .getString("filtersDialog.descriptionLabel")); 
            combo = new Combo(parent, SWT.READ_ONLY);
            combo.setFont(parent.getFont());
            combo.add(contains);
            combo.add(doesNotContain);
            combo.addSelectionListener(selectionListener);
            
            combo.addTraverseListener(new TraverseListener() {
                public void keyTraversed(TraverseEvent e) {
                    if (e.detail == SWT.TRAVERSE_ESCAPE
                            || e.detail == SWT.TRAVERSE_RETURN) {
                        e.doit = false;
                    }
                }
            });
            description = new Text(parent, SWT.SINGLE | SWT.BORDER);
            description.setFont(parent.getFont());
            GridData data = new GridData(GridData.FILL_HORIZONTAL);
            data.horizontalSpan = 3;
            description.setLayoutData(data);
            description.addModifyListener(new ModifyListener() {
                public void modifyText(ModifyEvent e) {
                    DialogProblemFilter.this.markDirty();
                }
            });