Does repelling flies during prayer, because they disrupt concentration, invalidate the prayer?

It appears that a worshipper's movement to ward off flies is considered a minor movement that does not invalidate the prayer, especially if it is for a need and is slight. This is because minor actions during prayer do not invalidate it, and the distinction between much and little is determined by common practice. It has been reported from the Prophet, peace and blessings be upon him, what indicates the permissibility of slight movement during prayer when there is a need.