Fix #14375: When loading config, validate timekeeping mode and minutes per year (#14405)

src/settings_table.cpp

@@ -667,6 +667,15 @@ static void ChangeMinutesPerYear(int32_t new_value)
 	}
 }
 
+/* Get the valid range of the "minutes per calendar year" setting. */
+static std::tuple<int32_t, uint32_t> GetMinutesPerYearRange(const IntSettingDesc &)
+{
+	/* Allow a non-default value only if using Wallclock timekeeping units. */
+	if (_settings_newgame.economy.timekeeping_units == TKU_WALLCLOCK) return { CalendarTime::FROZEN_MINUTES_PER_YEAR, CalendarTime::MAX_MINUTES_PER_YEAR };
+
+	return { CalendarTime::DEF_MINUTES_PER_YEAR, CalendarTime::DEF_MINUTES_PER_YEAR };
+}
+
 /**
  * Pre-callback check when trying to change the timetable mode. This is locked to Seconds when using wallclock units.
  * @param Unused.