I will use an easy example to focus my problem.
I have a cylinder, with this unwrap below. I scaled and moved the islands in the UV layout in order to optimize my UVs.
Right now, I don't want to modify my Uvs' island more . . . Suppose island's position and scale are perfect for my purposes. They have just to stay there.
Here's the problem: I can't export my cylinder with this topology (problem of my engine) then I have to fix my mesh in this way:
I didn't touch any mark seams during the process.
My question is: is there a command or a path in order to refresh the UV map? I would like to "refresh" the UV map with the new topology for the top and bottom face of cylinder without doing again the unwrap and scale-move my island.
P.S. I don't want to move again my UVs' islands because I already created the texture (with the first UV) and I'm afraid of not bieng able to match all perfectly with a new unwrap.