off by one error in CBA_fnc_mapGridToPos

[warzen]

Mods (complete and add to the following information):

• Arma 3: 1.98.146373
• CBA: `3.15.1
  Make sure to reproduce the issue with only CBA on a newly created mission!
  Only CBA, new mission.

Description:
both coordinates returned by CBA_fnc_mapGridToPos are wrong by one unit

Steps to reproduce:
example1: "000000" call CBA_fnc_mapGridToPos => [-1,-1,0] , it should be [0,0,0]
example2: "141212" CBA_fnc_mapGridToPos => [14099,21199,0] and that's in 140,211, not in 141,212

Where did the issue occur?
Editor (Singleplayer)

[Drofseh]

Hmm, strictly speak a grid designation refers to the whole square as well, not the bottom left corner.
Grid 141212 encompasses everything from positions [14100.00,21200.00] to [14199.99,21299.99] inclusive.
So in a mapping/military context it might make sense to return the centre of the grid for position.
"141212" call CBA_fnc_mapGridToPos //return [14150,21250]

Apparently it's supposed to be returning either centre or upper left if the _doOffSet parameter is true or false.
Upper left is always wrong in a map context since the grid number is taken from the bottom left of the grid square.

[warzen]

["0000000000",true] call CBA_fnc_mapGridToPos is returning [-1,-1,0] so in fact we have two bugs here:

• the off by one error on the calculation
• the fact that the lower left is return when _doOffSet is false. In this case, the two bugs are occuring.

And honestly, I don't know why you would want the upper left corner (as described in the doc). Bottom left seems more natural.