When you mouse over the undo and redo buttons in the standard toolbar, their shortcut keys dont appear in the tooltip.
For me it is a bug, not an enhancement. As far I can see, the issue concerns each program. Set component to UI Set status to NEW. Best regards. JBF
http://cgit.freedesktop.org/libreoffice/core/commit/?id=75a5dfeca0af580bb31f3aceee541d5f905b9101