[Vrul]

Here is nUI's relevant section changed to follow Blizzard's logic:

		if nUI_Options.boomkinBar then
			RegisterStateDriver(
				nUI_ActionBar, "page", string.format(
					"[vehicleui] %d; [overridebar] %d; [@vehicle,exists][possessbar] %d; [shapeshift] %d; " ..
					"[bar:2] 2; [bar:3] 3; [bar:4] 4; [bar:5] 5; [bar:6] 6; " ..
					"[bonusbar:1] 7; [bonusbar:2] 8; [bonusbar:3] 9; [bonusbar:4] 10; [bonusbar:5] 11; 1",
					GetVehicleBarIndex(), GetOverrideBarIndex(), GetVehicleBarIndex(), GetTempShapeshiftBarIndex()
				)
			);
		else
			RegisterStateDriver(
				nUI_ActionBar, "page", string.format(
					"[vehicleui] %d; [overridebar] %d; [@vehicle,exists][possessbar] %d; [shapeshift] %d; " ..
					"[bar:2] 2; [bar:3] 3; [bar:4] 4; [bar:5] 5; [bar:6] 6; " ..
					"[bonusbar:1] 7; [bonusbar:2] 8; [bonusbar:3] 9; [bonusbar:4] 1; [bonusbar:5] 11; 1",
					GetVehicleBarIndex(), GetOverrideBarIndex(), GetVehicleBarIndex(), GetTempShapeshiftBarIndex()
				)
			);
		end