Compact MIN/MAXTEMP_ALL

Marlin/src/lcd/menu/menu_configuration.cpp

 #if DISABLED(SLIM_LCD_MENUS)
 
   void _menu_configuration_preheat_settings(const uint8_t material) {
-    #if HOTENDS > 5
-      #define MINTEMP_ALL _MIN(HEATER_0_MINTEMP, HEATER_1_MINTEMP, HEATER_2_MINTEMP, HEATER_3_MINTEMP, HEATER_4_MINTEMP, HEATER_5_MINTEMP)
-      #define MAXTEMP_ALL _MAX(HEATER_0_MAXTEMP, HEATER_1_MAXTEMP, HEATER_2_MAXTEMP, HEATER_3_MAXTEMP, HEATER_4_MAXTEMP, HEATER_5_MAXTEMP)
-    #elif HOTENDS > 4
-      #define MINTEMP_ALL _MIN(HEATER_0_MINTEMP, HEATER_1_MINTEMP, HEATER_2_MINTEMP, HEATER_3_MINTEMP, HEATER_4_MINTEMP)
-      #define MAXTEMP_ALL _MAX(HEATER_0_MAXTEMP, HEATER_1_MAXTEMP, HEATER_2_MAXTEMP, HEATER_3_MAXTEMP, HEATER_4_MAXTEMP)
-    #elif HOTENDS > 3
-      #define MINTEMP_ALL _MIN(HEATER_0_MINTEMP, HEATER_1_MINTEMP, HEATER_2_MINTEMP, HEATER_3_MINTEMP)
-      #define MAXTEMP_ALL _MAX(HEATER_0_MAXTEMP, HEATER_1_MAXTEMP, HEATER_2_MAXTEMP, HEATER_3_MAXTEMP)
-    #elif HOTENDS > 2
-      #define MINTEMP_ALL _MIN(HEATER_0_MINTEMP, HEATER_1_MINTEMP, HEATER_2_MINTEMP)
-      #define MAXTEMP_ALL _MAX(HEATER_0_MAXTEMP, HEATER_1_MAXTEMP, HEATER_2_MAXTEMP)
-    #elif HOTENDS > 1
-      #define MINTEMP_ALL _MIN(HEATER_0_MINTEMP, HEATER_1_MINTEMP)
-      #define MAXTEMP_ALL _MAX(HEATER_0_MAXTEMP, HEATER_1_MAXTEMP)
-    #else
-      #define MINTEMP_ALL HEATER_0_MINTEMP
-      #define MAXTEMP_ALL HEATER_0_MAXTEMP
-    #endif
+    #define MINTEMP_ALL _MIN(LIST_N(HOTENDS, HEATER_0_MINTEMP, HEATER_1_MINTEMP, HEATER_2_MINTEMP, HEATER_3_MINTEMP, HEATER_4_MINTEMP, HEATER_5_MINTEMP), 999)
+    #define MAXTEMP_ALL _MAX(LIST_N(HOTENDS, HEATER_0_MAXTEMP, HEATER_1_MAXTEMP, HEATER_2_MAXTEMP, HEATER_3_MAXTEMP, HEATER_4_MAXTEMP, HEATER_5_MAXTEMP), 0)
     START_MENU();
     BACK_ITEM(MSG_CONFIGURATION);
     EDIT_ITEM(percent, MSG_FAN_SPEED, &ui.preheat_fan_speed[material], 0, 255);