[16.4] Fog-of-war disappears when scrolling zoomed map

[iannucci]

No mods. OS X 10.11.6 (15G1004), Intel HD Graphics 4000 1536 MB

Steps to reproduce:
1. New game
2. Press map key
3. Zoom in until terrain is visible (zoomed-from-map mode)
4. Hold down "move up" key

Expected results:
First, in-radar area scrolls by and out-of-radar zone explored area begins to appear.

1.png (2.59 MiB) Viewed 564 times

Next, out-of-radar zone explored area scrolls by and blackness begins to fill the screen.

2.png (1.47 MiB) Viewed 564 times

Next, blackness fills the screen forever.

Actual results:
As soon as blackness ought to fill the screen, the fog suddenly disappears and the actual (unexplored) terrain becomes fully revealed as if it were in-radar.

3.png (2.85 MiB) Viewed 564 times

This appears to be a graphical glitch only; the terrain isn't becoming explored.

[posila]

Thanks for the report.
This has been fixed for 0.16.5: 55044