Annotate SetNavigatorPersonalPosMaxDistance and check it exists before calling it

changelog/snippets/other.7155.md

@@ -0,0 +1 @@
+- (#7155) Annotate `SetNavigatorPersonalPosMaxDistance` and check it exists before calling it.

engine/Sim.lua

@@ -1194,6 +1194,19 @@ end
 function SetIgnorePlayableRect(army, ignore)
 end
 
+--- Changes the distance at which the default navigator switches to a lower resolution
+--- pathfinding grid, typically resulting in units moving in columns over large distances
+--- instead of maintaining their formation.
+---
+--- Default engine value is 50.
+---
+--- Useful console commands for debugging: "dbg navwaypoints", "dbg navpath", "dbg navsteering"
+---
+--- Introduced by https://github.com/FAForever/FA-Binary-Patches/pull/132
+---@param distance number
+function SetNavigatorPersonalPosMaxDistance(distance)
+end
+
 --- sets the playable area of a map
 ---@param minX number
 ---@param minZ number

lua/simInit.lua

@@ -586,7 +586,9 @@ end
 -- will be using personal positioning instead of waypoints for any move order (doesn't affect "formation move").
 -- useful console commands for debugging: "dbg navwaypoints", "dbg navpath", "dbg navsteering"
 function SetupPathfinding()
-    SetNavigatorPersonalPosMaxDistance(9999)
+    if rawget(_G, "SetNavigatorPersonalPosMaxDistance") then
+        SetNavigatorPersonalPosMaxDistance(9999)
+    end
 end
 
 -- these imports break cycle dependencies of import sequences of mods