Current Active Tool Display
When you select a tool, the name of the tool and icon appears Top Centre of the viewport by default.
This gives feedback to users, especially when they have accidentally hit a keystroke or make a gesture by mistake.
This appears exactly as it does in the marking menu, framed with the options dialog next to it.
When the tool is deselected, it greys out but shows the keystroke for repeat command next to it. This means you always know what the G key will do next.