Saveload: Add save flag for if this is a scenario save

src/openttd.cpp

@@ -1361,15 +1361,18 @@ void SwitchToMode(SwitchMode new_mode)
 			}
 			break;
 
-		case SM_SAVE_GAME: // Save game.
+		case SM_SAVE_GAME: { // Save game.
 			/* Make network saved games on pause compatible to singleplayer mode */
-			if (SaveOrLoad(_file_to_saveload.name, SLO_SAVE, DFT_GAME_FILE, NO_DIRECTORY) != SL_OK) {
+			SaveModeFlags flags = SMF_NONE;
+			if (_game_mode == GM_EDITOR) flags |= SMF_SCENARIO;
+			if (SaveOrLoad(_file_to_saveload.name, SLO_SAVE, DFT_GAME_FILE, NO_DIRECTORY, true, flags) != SL_OK) {
 				SetDParamStr(0, GetSaveLoadErrorString());
 				ShowErrorMessage(STR_JUST_RAW_STRING, INVALID_STRING_ID, WL_ERROR);
 			} else {
 				DeleteWindowById(WC_SAVELOAD, 0);
 			}
 			break;
+		}
 
 		case SM_SAVE_HEIGHTMAP: // Save heightmap.
 			MakeHeightmapScreenshot(_file_to_saveload.name.c_str());

src/saveload/saveload.cpp

@@ -3312,6 +3312,11 @@ bool IsNetworkServerSave()
 	return _sl.save_flags & SMF_NET_SERVER;
 }
 
+bool IsScenarioSave()
+{
+	return _sl.save_flags & SMF_SCENARIO;
+}
+
 struct ThreadedLoadFilter : LoadFilter {
 	static const size_t BUFFER_COUNT = 4;
 

src/saveload/saveload.h

@@ -56,6 +56,7 @@ enum SaveModeFlags : byte {
 	SMF_NONE             = 0,
 	SMF_NET_SERVER       = 1 << 0, ///< Network server save
 	SMF_ZSTD_OK          = 1 << 1, ///< Zstd OK
+	SMF_SCENARIO         = 1 << 2, ///< Scenario save
 };
 DECLARE_ENUM_AS_BIT_SET(SaveModeFlags);
 
@@ -74,6 +75,7 @@ void DoAutoOrNetsave(FiosNumberedSaveName &counter, bool threaded);
 SaveOrLoadResult SaveWithFilter(struct SaveFilter *writer, bool threaded, SaveModeFlags flags);
 SaveOrLoadResult LoadWithFilter(struct LoadFilter *reader);
 bool IsNetworkServerSave();
+bool IsScenarioSave();
 
 typedef void ChunkSaveLoadProc();
 typedef void AutolengthProc(void *arg);