I want to keep the dock hidden and to show it with a short-key associated to a command.
Is there a such command to show the Plank dock?
When shown I would prefer to have it under rather than above maximized window.
The dock becomes visible when no window pressures it.
The dock is always shown on an empty workspace. So, the shortkey to cycle workspaces Super-Tab can be used. 'Restrict to workspace' should better not be enabled in this case. Cycling to an empty workspace with Super-Tab reveals the hidden dock.
Toggling Maximize on/off may show the hidden dock.