changelog: Map corruption bugfix

CHANGELOG.md

@@ -138,6 +138,7 @@
     Bug #5134: Doors rotation by "Lock" console command is inconsistent
     Bug #5137: Textures with Clamp Mode set to Clamp instead of Wrap are too dark outside the boundaries
     Bug #5149: Failing lock pick attempts isn't always a crime
+    Bug #5177: Editor: Unexplored map tiles get corrupted after a file with terrain is saved
     Feature #1774: Handle AvoidNode
     Feature #2229: Improve pathfinding AI
     Feature #3025: Analogue gamepad movement controls

CHANGELOG_PR.md

@@ -102,6 +102,7 @@ Editor Bug Fixes:
 - Cloned, added, or moved instances no longer disappear at load-time (#4748)
 - "Clear" function in the content selector no longer tries to execute a "Remove" action on an empty file list (#4757)
 - Engine no longer tries to swap buffers of windows which weren't exposed to Qt's window management system (#4911)
+- Minimap doesn't get corrupted, when editing new omwgame (#5177)
 
 Miscellaneous:
 - Upgraded to FFMPEG3 for media decoding (#4686)