Fix save/load and GUI for locale.units_velocity_nautical setting

src/saveload/extended_ver_sl.cpp

@@ -193,6 +193,7 @@ const SlxiSubChunkInfo _sl_xv_sub_chunk_infos[] = {
 	{ XSLFI_LINKGRAPH_TRAVEL_TIME,            XSCF_NULL,                1,   1, "linkgraph_travel_time",            nullptr, nullptr, nullptr          },
 	{ XSLFI_LAST_LOADING_TICK,                XSCF_NULL,                2,   2, "last_loading_tick",                nullptr, nullptr, nullptr          },
 	{ XSLFI_SCRIPT_LEAGUE_TABLES,             XSCF_NULL,                1,   1, "script_league_tables",             nullptr, nullptr, "LEAE,LEAT"      },
+	{ XSLFI_VELOCITY_NAUTICAL,                XSCF_IGNORABLE_ALL,       1,   1, "velocity_nautical",                nullptr, nullptr, nullptr          },
 	{ XSLFI_NULL, XSCF_NULL, 0, 0, nullptr, nullptr, nullptr, nullptr },// This is the end marker
 };
 

src/saveload/extended_ver_sl.h

@@ -145,6 +145,7 @@ enum SlXvFeatureIndex {
 	XSLFI_LINKGRAPH_TRAVEL_TIME,                  ///< See: SLV_LINKGRAPH_TRAVEL_TIME
 	XSLFI_LAST_LOADING_TICK,                      ///< See: SLV_LAST_LOADING_TICK
 	XSLFI_SCRIPT_LEAGUE_TABLES,                   ///< See: Scriptable league tables (PR #10001)
+	XSLFI_VELOCITY_NAUTICAL,                      ///< See: SLV_VELOCITY_NAUTICAL (PR #10594)
 
 	XSLFI_RIFF_HEADER_60_BIT,                     ///< Size field in RIFF chunk header is 60 bit
 	XSLFI_HEIGHT_8_BIT,                           ///< Map tile height is 8 bit instead of 4 bit, but savegame version may be before this became true in trunk

src/table/settings/settings.ini

@@ -4203,7 +4203,7 @@ strval   = STR_CONFIG_SETTING_LOCALISATION_UNITS_VELOCITY_IMPERIAL
 var      = locale.units_velocity_nautical
 type     = SLE_UINT8
 from     = SLV_VELOCITY_NAUTICAL
-flags    = SF_NO_NETWORK_SYNC | SF_GUI_DROPDOWN
+flags    = SF_NO_NETWORK_SYNC | SF_GUI_DROPDOWN | SF_ENABLE_UPSTREAM_LOAD
 def      = 1
 max      = 4
 full     = _locale_units
@@ -4212,6 +4212,8 @@ cat      = SC_BASIC
 str      = STR_CONFIG_SETTING_LOCALISATION_UNITS_VELOCITY_NAUTICAL
 strhelp  = STR_CONFIG_SETTING_LOCALISATION_UNITS_VELOCITY_HELPTEXT
 strval   = STR_CONFIG_SETTING_LOCALISATION_UNITS_VELOCITY_IMPERIAL
+extver   = SlXvFeatureTest(XSLFTO_OR, XSLFI_VELOCITY_NAUTICAL)
+patxname = ""locale.units_velocity_nautical""
 
 [SDT_OMANY]
 var      = locale.units_power