Been playing around with it in 1.2.6.286 and will post what I have observed:
* Only works for fully revealed rooms and not unrevealed rooms where you know its position thanks to the red map pickup, in the latter case the appearance of such rooms on your map are local to that saved game. I think this is fine and isn't worth bothering to change/improve if its a huge deal.
* Fully and partially revealed room behaviours are also working as expected when using the Add Room to Map scripting command, where a room that you have never stepped inside that is fully revealed this way will still show up on other saves and new games.
* Maps appear to be updating correctly for games that were started in versions prior to 1.2.6.286. Starting a new game led the map to show only the rooms I had currently explored in previous saved games, and exploring a new room added it to the map in all of the other saves.
* Once a map has been revealed it will also show up in the minimap on the load game screen, including for old saved games, which is neat!
* Colours on the minimap, whether automatically determined by the room contents or by changing them yourself by right-clicking, stay local to the specific saved game.
* Creating a new player profile correctly does not pull in the map info form other profiles and starts with fully unrevealed maps.
* Custom monsters do not show their correct colour (if updated by _MyColor variable) and cannot have their stats shown on the battle predictor when remotely viewing the room before entering it on that specific save. This is because scripts are not run on characters until you enter the room for the first time. This is not a problem specific to this feature (see the published hold Growing which uses the Add Room to Map command to reveal the whole level at the start, where these issues have been present since forever), however I'm bringing it up because with this new feature this will now be extremely obvious to basically anybody who plays a hold with custom monsters.
P.S. This feature is appreciated so so much. Thanks!
[Last edited by kieranmillar at 03-20-2016 06:42 PM]