I just want to signal that the healing bonus granted from camping and items ( fulvano amulet, mahea armor) does not work for the healing received from draining items ( es oidarecht, tidefall)

Looking at the code I think that's intentional though. It doesn't get the Might healing percentage bonus either, at any rate (though obviously higher Might does indirectly boost the healing by increasing the damage dealt). 

 

Should the devs want to consider changing it though: it's the GainStaminaWhenHits ModifiedStat, which ends up in a call to the Health.AddStamina() function. Adding the bonuses should be a simple matter of just putting a call to the Health.AdjustHealing() function (like in the Health.ApplyStaminaChangeDirectly() function).