🐛 Fix status_printf alert level

Marlin/src/lcd/marlinui.cpp

 
   #include <stdarg.h>
 
-  void MarlinUI::status_printf(const uint8_t level, FSTR_P const fmt, ...) {
+  void MarlinUI::status_printf(int8_t level, FSTR_P const fmt, ...) {
+    // Alerts block lower priority messages
+    if (level < 0) level = alert_level = 0;
     if (level < alert_level) return;
     alert_level = level;
+
     va_list args;
     va_start(args, FTOP(fmt));
     vsnprintf_P(status_message, MAX_MESSAGE_LENGTH, FTOP(fmt), args);
 
   #endif
 
-#endif
+#else // !HAS_STATUS_MESSAGE
+
+  //
+  // Send the status line as a host notification
+  //
+  void MarlinUI::set_status(const char * const cstr, const bool) {
+    TERN(HOST_PROMPT_SUPPORT, hostui.notify(cstr), UNUSED(cstr));
+  }
+  void MarlinUI::set_status(FSTR_P const fstr, const int8_t) {
+    TERN(HOST_PROMPT_SUPPORT, hostui.notify(fstr), UNUSED(fstr));
+  }
+  void MarlinUI::status_printf(int8_t, FSTR_P const fstr, ...) {
+    TERN(HOST_PROMPT_SUPPORT, hostui.notify(fstr), UNUSED(fstr));
+  }
+
+#endif // !HAS_STATUS_MESSAGE
 
 #if HAS_DISPLAY
 
 
   #endif
 
-#elif !HAS_STATUS_MESSAGE // && !HAS_DISPLAY
-
-  //
-  // Send the status line as a host notification
-  //
-  void MarlinUI::set_status(const char * const cstr, const bool) {
-    TERN(HOST_PROMPT_SUPPORT, hostui.notify(cstr), UNUSED(cstr));
-  }
-  void MarlinUI::set_status(FSTR_P const fstr, const int8_t) {
-    TERN(HOST_PROMPT_SUPPORT, hostui.notify(fstr), UNUSED(fstr));
-  }
-  void MarlinUI::status_printf(const uint8_t, FSTR_P const fstr, ...) {
-    TERN(HOST_PROMPT_SUPPORT, hostui.notify(fstr), UNUSED(fstr));
-  }
-
-#endif // !HAS_DISPLAY && !HAS_STATUS_MESSAGE
+#endif // HAS_DISPLAY
 
 #if ENABLED(SDSUPPORT)
 

Marlin/src/lcd/marlinui.h

 
   static void set_status(const char * const cstr, const bool persist=false);
   static void set_status(FSTR_P const fstr, const int8_t level=0);
-  static void status_printf(const uint8_t level, FSTR_P const fmt, ...);
+  static void status_printf(int8_t level, FSTR_P const fmt, ...);
 
   #if HAS_DISPLAY