Bug 73027 [Dialogs] Buttons are too high
I20040831 Buttons are no longer oval but have a rounded rectangle shape (see first screenshot). The second screenshot shows how buttons using the small system font should look like.
bundles/org.eclipse.jface/src/org/eclipse/jface/preference/ListEditor.java
protected ListEditor() {
    }
    /**
     * Creates a list field editor.
     * 
     * @param name the name of the preference this field editor works on
     * @param labelText the label text of the field editor
     * @param parent the parent of the field editor's control
     */
    protected ListEditor(String name, String labelText, Composite parent) {
        init(name, labelText);
        createControl(parent);
    }
    /**
     * Notifies that the Add button has been pressed.
     */
    private void addPressed() {
        setPresentsDefaultValue(false);
        String input = getNewInputObject();
        if (input != null) {
            int index = list.getSelectionIndex();
            if (index >= 0)
                list.add(input, index + 1);
            else
                list.add(input, 0);
            selectionChanged();
        }
    }
    /* (non-Javadoc)
     * Method declared on FieldEditor.