MapIndex::fixUIDs() concept idea (Adspartan)

Step 1:

read every tile
for each tile read all the modf and mddf entries
discard the entries not placed on the current tile (eg entry.pos isn't inside the tile)
discard duplicates
read the filenames
create the model/wmo instances and add them to a list

-> [tile -> [(mdf, filename)]] where (mdf, filename) is unique by transformation, only entries with inside (tile, .pos) are stored

Step 2:

create 2 lists for each tile, one for the wmo and one for the m2
assign a new uid for the instances (starting from 0)
add every model/wmo instances to the lists of every tiles they are on

-> [[tile] -> [(uid, m*df, filename)] where uid is 0..n, all entries where intersect (tile, .extends) are stored

Step 3:

load each tile without the models/wmos
save the tile with the model/wmo instances from step 2

Step 4:

save the highest uid on the disc to not have to repeat the process ever again

Claim

Every entity has a globally unique id in 2I, 1O
uniqueness of newly placed objects is guaranteed by storing highest uid on disk

Shortcomings

does not work with parallel work by multiple editors on same map, or requires a central fix-pass every so often, which is undesirable -> requires one pass after a fuckup which still can exist -> valid and good for single-person work