Fix false ledge grabs when fixCollisionBugs is on

mods/arena/main.lua

@@ -66,6 +66,9 @@ sRandomizeMode = true
 gServerSettings.playerInteractions = PLAYER_INTERACTIONS_PVP
 gServerSettings.playerKnockbackStrength = 20
 
+-- use fixed collisions
+gLevelValues.fixCollisionBugs = 1
+
 function calculate_rankings()
     local rankings = {}
     for i = 0, (MAX_PLAYERS - 1) do

src/game/mario_step.c

@@ -418,6 +418,13 @@ u32 check_ledge_grab(struct MarioState *m, struct Surface *wall, Vec3f intendedP
     ledgePos[2] = nextPos[2] - wall->normal.z * 60.0f;
     ledgePos[1] = find_floor(ledgePos[0], nextPos[1] + 160.0f, ledgePos[2], &ledgeFloor);
 
+    if (gLevelValues.fixCollisionBugs) {
+        // fix false ledge grabs
+        if (!ledgeFloor || ledgeFloor->normal.y < 0.90630779f) {
+            return FALSE;
+        }
+    }
+
     if (ledgePos[1] - nextPos[1] <= 100.0f) {
         return FALSE;
     }