HoMM3 HD is a mod (add-on) for the game Heroes of Might and Magic 3.

A very useful feature has appeared in Warlords - by holding Alt and left-clicking, it shows the distance in movement points from the hero to a specified point and the remaining movement points at the end of the route. This significantly saves time for those who count squares and eliminates errors for those who rely on visual estimation. It would be good to add something similar to the mod.

I'm all for it! I already suggested this option, but for some reason, it didn't generate any interest. Although, it would be a really convenient feature. I haven't checked in Warlords, but it seems like this key combination would be very useful:
while holding down a key, press the left mouse button - the number of movement points used is displayed, then, without releasing the held key, click with the right mouse button in any point on the field, and the number of movement points spent to reach the second point along the path through the first point is displayed. (if you need to go, for example, slightly up and to the left behind a chest, and then go to the right somewhere behind another chest).