Fix Lua scripts not being read from WAD files

Source/Core/Data/WADReader.cs

@@ -1140,7 +1140,7 @@ namespace CodeImp.DoomBuilder.Data
 		{
 			if (issuspended) throw new Exception("Data reader is suspended");
 
-			return GetAllLumpsData("LUA_");
+			return GetAllLumpsDataWithPrefix("LUA_");
 		}
 
 		//mxd
@@ -1192,6 +1192,25 @@ namespace CodeImp.DoomBuilder.Data
 			return result;
 		}
 
+		//mxd
+		private List<TextResourceData> GetAllLumpsDataWithPrefix(string prefix)
+		{
+			List<TextResourceData> result = new List<TextResourceData>();
+
+			// Find all lumps with given name
+			int lumpindex = file.FindLumpIndexWithPrefix(prefix);
+			while (lumpindex > -1)
+			{
+				// Add to collection
+				result.Add(new TextResourceData(this, file.Lumps[lumpindex].GetSafeStream(), prefix, lumpindex, true));
+
+				// Find next entry
+				lumpindex = file.FindLumpIndexWithPrefix(prefix, lumpindex + 1);
+			}
+
+			return result;
+		}
+
 		#endregion
 
 		#region ================== IO (mxd)

Source/Core/IO/WAD.cs

@@ -568,6 +568,44 @@ namespace CodeImp.DoomBuilder.IO
 			return -1;
 		}
 
+		// This finds a lump with given prefix, returns -1 when not found
+		public int FindLumpIndexWithPrefix(string prefix)
+		{
+			// Do search
+			return FindLumpIndexWithPrefix(prefix, 0, lumps.Count - 1);
+		}
+
+		// This finds a lump with given prefix, returns -1 when not found
+		public int FindLumpIndexWithPrefix(string prefix, int start)
+		{
+			// Do search
+			return FindLumpIndex(prefix, start, lumps.Count - 1);
+		}
+
+		// This finds a lump with given prefix, returns -1 when not found
+		public int FindLumpIndexWithPrefix(string prefix, int start, int end)
+		{
+			if (prefix.Length > 8 || lumps.Count == 0 || start > lumps.Count - 1) return -1; //mxd. Can't be here. Go away!
+
+			// Fix start/end when they exceed safe bounds
+			start = Math.Max(start, 0);
+			end = General.Clamp(end, 0, lumps.Count - 1);
+
+			// Loop through the lumps
+			for (int i = start; i < end + 1; i++)
+			{
+				// Check if the lump name matches
+				if (lumps[i].Name.StartsWith(prefix))
+				{
+					// Found the lump!
+					return i;
+				}
+			}
+
+			// Nothing found
+			return -1;
+		}
+
 		//mxd. Same as above, but searches in reversed order
 
 		// This finds a lump by name, returns null when not found