- give the tag manager a reference to the level.

This is needed for the compatibility search of the sector tag iterator which linearly searches the sector array.

src/g_levellocals.h

@@ -154,6 +154,8 @@ struct FLevelData
 
 struct FLevelLocals : public FLevelData
 {
+	FLevelLocals() : tagManager(this) {}
+
 	friend class MapLoader;
 
 	void Tick();

src/p_tags.cpp

@@ -346,11 +346,11 @@ int FSectorTagIterator::Next()
 	else
 	{
 		// with the tag manager, searching for tag 0 has to be different, because it won't create entries for untagged sectors.
-		while (start < (int)level.sectors.Size() && tagManager.SectorHasTags(start))
+		while (start < (int)tagManager.Level->sectors.Size() && tagManager.SectorHasTags(start))
 		{
 			start++;
 		}
-		if (start == (int)level.sectors.Size()) return -1;
+		if (start == (int)tagManager.Level->sectors.Size()) return -1;
 		ret = start;
 		start++;
 	}
@@ -367,7 +367,7 @@ int FSectorTagIterator::NextCompat(bool compat, int start)
 {
 	if (!compat) return Next();
 
-	for (unsigned i = start + 1; i < level.sectors.Size(); i++)
+	for (unsigned i = start + 1; i < tagManager.Level->sectors.Size(); i++)
 	{
 		if (level.SectorHasTag(i, searchtag)) return i;
 	}

src/p_tags.h

@@ -29,6 +29,7 @@ class FTagManager
 	friend struct FLevelLocals;
 	friend class UDMFParser;
 
+	FLevelLocals *Level;
 	TArray<FTagItem> allTags;
 	TArray<FTagItem> allIDs;
 	TArray<int> startForSector;
@@ -46,6 +47,8 @@ class FTagManager
 		return sect >= 0 && sect < (int)startForLine.Size() && startForLine[sect] >= 0;
 	}
 
+
+    FTagManager(FLevelLocals *l) : Level(l) {}
 	void Clear()
 	{
 		allTags.Clear();