Fix load check of a savegame with realistic braking enabled triggering signal checks on current game

src/settings.cpp

@@ -463,7 +463,7 @@ size_t BoolSettingDesc::ParseValue(const char *str) const
 
 static bool ValidateEnumSetting(const IntSettingDesc *sdb, int32 &val)
 {
-	if (sdb->pre_check != nullptr && !sdb->pre_check(val)) return false;
+	if (sdb->flags & SF_ENUM_PRE_CB_VALIDATE && sdb->pre_check != nullptr && !sdb->pre_check(val)) return false;
 	for (const SettingDescEnumEntry *enumlist = sdb->enumlist; enumlist != nullptr && enumlist->str != STR_NULL; enumlist++) {
 		if (enumlist->val == val) {
 			return true;

src/settings_internal.h

@@ -34,6 +34,7 @@ enum SettingFlag : uint32 {
 	SF_RUN_CALLBACKS_ON_PARSE  = 1 << 17, ///< run callbacks when parsing from config file
 	SF_GUI_VELOCITY            = 1 << 18, ///< setting value is a velocity
 	SF_GUI_ADVISE_DEFAULT      = 1 << 19, ///< Advise the user to leave this setting at its default value
+	SF_ENUM_PRE_CB_VALIDATE    = 1 << 20, ///< Call the pre_check callback for enum incoming value validation
 };
 DECLARE_ENUM_AS_BIT_SET(SettingFlag)
 

src/table/settings/settings.ini

@@ -436,6 +436,7 @@ cat      = SC_BASIC
 var      = difficulty.town_council_tolerance
 type     = SLE_UINT8
 from     = SLV_97
+flags    = SF_ENUM_PRE_CB_VALIDATE
 def      = 0
 enumlist = _town_council_approval
 str      = STR_CONFIG_SETTING_CITY_APPROVAL