Add G26 to the process_next_command() function and include a gcode_g2…

…6() function

The actual execution of G26 is done inside get_serial_commands(), this commit is just for completeness.

Marlin/Marlin_main.cpp

@@ -2552,6 +2552,16 @@ inline void gcode_G4() {
 
 #endif //FWRETRACT
 
+/**
+ * G26: Allow G-codes to enter the buffer again after a PROBE_FAIL_PANIC occurs during a G29
+ */
+#if ENABLED(PROBE_FAIL_PANIC)
+  inline void gcode_G26() {
+    LCD_MESSAGEPGM(WELCOME_MSG);
+    probe_fail = false;
+  }
+#endif
+
 /**
  * G28: Home all axes according to settings
  *
@@ -6598,6 +6608,12 @@ void process_next_command() {
 
       #endif //FWRETRACT
 
+      #if ENABLED(PROBE_FAIL_PANIC)
+        case 26: // G26: Allow G-codes to enter the buffer again after a PROBE_FAIL_PANIC occurs during a G29
+          gcode_G26();
+          break;
+      #endif
+
       case 28: // G28: Home all axes, one at a time
         gcode_G28();
         break;