This patch provides a keybinding to rotate all clients in the currently selected area (master or stack) without affecting the other area.

This allows you to shift the ordering of clients in the master / stack area without worrying clients will transfer between the master / stack (nmaster) boundry. If your current focus is in the master area, clients in the master rotate and stack clients are left alone. And inversely, if you're focused on a client in the stack, stack clients are rotated but master clients are left alone. Also in addition to not affecting the nmaster boundry, the focused client is always kept fixed on the current position (e.g. the screen focus area doesn't change) making this a fully 'in-place' rotation.