The ruling on combining and shortening prayers for one who has entered the time but has not yet departed?

Q: If the time enters while he is in the city, and then he travels before performing the prayer, is he entitled to shorten and combine, or not? Likewise, if he prays Dhuhr and Asr (for example) by shortening and combining them, and then arrives in his city during the time of Asr, is his action valid? He knows that the time for shortening and combining is such that he will arrive in his city during the time of the second prayer.

A: If the time for prayer enters for the traveler while he is in the city, and then he departs before praying, shortening is prescribed for him if he leaves the inhabited part of the city, according to the most correct of the two opinions of the scholars, which is the opinion of the majority.
If he combines and shortens during the journey, and then arrives in the city before the time of the second prayer enters, or during the time of the second prayer, he is not required to repeat the prayer, because he has performed the prayer in the manner prescribed by the Shari'ah. If he prays the second prayer with the people, it becomes a voluntary prayer for him.