Merged in GZDB r2478.

Source/Core/Data/DataManager.cs

@@ -365,10 +365,9 @@ namespace CodeImp.DoomBuilder.Data
 			int colormapcount = LoadColormaps(colormapsonly);
 			LoadSprites();
 
-			//mxd. Load MAPINFO. Should happen before parisng DECORATE
-			Dictionary<int, string> spawnnums;
-			Dictionary<int, string> doomednums;
-			LoadMapInfo(out spawnnums, out doomednums);
+            //mxd. Load MAPINFO. Should happen before parisng DECORATE
+            Dictionary<int, string> spawnnums, doomednums;
+            LoadMapInfo(out spawnnums, out doomednums);
 
 			int thingcount = LoadDecorateThings(spawnnums, doomednums);
 			int spritecount = LoadThingSprites();
@@ -2083,6 +2082,13 @@ namespace CodeImp.DoomBuilder.Data
             skyboxes = parser.Skyboxes;
         }
 
+        //mxd. This updates mapinfo class only
+        internal void ReloadMapInfoPartial()
+        {
+            Dictionary<int, string> spawnnums, doomednums;
+            LoadMapInfo(out spawnnums, out doomednums);
+        }
+
         //mxd. This loads (Z)MAPINFO
         private void LoadMapInfo(out Dictionary<int, string> spawnnums, out Dictionary<int, string> doomednums)
         {

Source/Core/General/General.cs

@@ -1242,26 +1242,6 @@ namespace CodeImp.DoomBuilder
 			ChangeMapForm changemapwindow = new ChangeMapForm(map.FilePathName, map.Options);
 			if(changemapwindow.ShowDialog(mainwindow) != DialogResult.OK) return;
 
-			// If resources don't match, perform regular map loading
-			bool resourcesmismatch = changemapwindow.Options.Resources.Count != map.Options.Resources.Count;
-			if(!resourcesmismatch)
-			{
-				for(int i = 0; i < changemapwindow.Options.Resources.Count; i++) 
-				{
-					if(changemapwindow.Options.Resources[i].location != map.Options.Resources[i].location)
-					{
-						resourcesmismatch = true;
-						break;
-					}
-				}
-			}
-
-			if(resourcesmismatch) 
-			{
-				OpenMapFileWithOptions(map.FilePathName, changemapwindow.Options);
-				return;
-			}
-
 			// Display status
 			mainwindow.DisplayStatus(StatusType.Busy, "Switching to map '" + changemapwindow.Options.CurrentName + "'...");
 			WriteLogLine("Switching to map '" + changemapwindow.Options.CurrentName + "'...");

Source/Core/General/MapManager.cs

@@ -527,6 +527,9 @@ namespace CodeImp.DoomBuilder
 			// Sector textures may've been changed 
 			data.UpdateUsedTextures();
 
+            // This will update DataManager.mapinfo only
+            data.ReloadMapInfoPartial();
+
             // Skybox may've been changed
             data.SetupSkybox();
 

Source/Core/Windows/ChangeMapForm.cs

@@ -198,7 +198,8 @@ namespace CodeImp.DoomBuilder.Windows
 			MapOptions newoptions = new MapOptions(mapsettings, mapslist.SelectedItems[0].Text, options.UseLongTextureNames);
 			newoptions.ConfigFile = options.ConfigFile;
 			newoptions.ScriptCompiler = options.ScriptCompiler;
-			options = newoptions;
+            newoptions.CopyResources(options.Resources);
+            options = newoptions;
 			
 			// Hide window
 			this.DialogResult = DialogResult.OK;