Inline manage_inactivity, tweak autoreport_paused

Marlin/src/MarlinCore.cpp

   bool wait_for_user; // = false;
 #endif
 
-#if HAS_AUTO_REPORTING || ENABLED(HOST_KEEPALIVE_FEATURE)
-  bool suspend_auto_report; // = false
-#endif
-
 // Inactivity shutdown
 millis_t max_inactive_time, // = 0
          stepper_inactive_time = (DEFAULT_STEPPER_DEACTIVE_TIME) * 1000UL;
  *  - Pulse FET_SAFETY_PIN if it exists
  */
 
-void manage_inactivity(const bool ignore_stepper_queue/*=false*/) {
+inline void manage_inactivity(const bool ignore_stepper_queue=false) {
 
   #if HAS_FILAMENT_SENSOR
     runout.run();
   #endif
 
   #if HAS_AUTO_REPORTING
-    if (!suspend_auto_report) {
+    if (!gcode.autoreport_paused) {
       #if ENABLED(AUTO_REPORT_TEMPERATURES)
         thermalManager.auto_report_temperatures();
       #endif

Marlin/src/MarlinCore.h

   #endif
 );
 
-void manage_inactivity(const bool ignore_stepper_queue=false);
-
 #if ENABLED(EXPERIMENTAL_I2CBUS)
   #include "feature/twibus.h"
   extern TWIBus i2c;
   extern bool wait_for_user;
 #endif
 
-#if HAS_AUTO_REPORTING || ENABLED(HOST_KEEPALIVE_FEATURE)
-  extern bool suspend_auto_report;
-#endif
-
 // Inactivity shutdown timer
 extern millis_t max_inactive_time, stepper_inactive_time;
 

Marlin/src/core/utility.cpp

   thermalManager.manage_heater(); // This keeps us safe if too many small safe_delay() calls are made
 }
 
+// A delay to provide brittle hosts time to receive bytes
+#if ENABLED(SERIAL_OVERRUN_PROTECTION)
+
+  #include "../gcode/gcode.h" // for set_autoreport_paused
+
+  void serial_delay(const millis_t ms) {
+    const bool was = gcode.set_autoreport_paused(true);
+    safe_delay(ms);
+    gcode.set_autoreport_paused(was);
+  }
+#endif
+
 #if ENABLED(DEBUG_LEVELING_FEATURE)
 
   #include "../module/probe.h"

Marlin/src/core/utility.h

 // Delay that ensures heaters and watchdog are kept alive
 void safe_delay(millis_t ms);
 
-// A delay to provide brittle hosts time to receive bytes
-inline void serial_delay(const millis_t ms) {
-  #if ENABLED(SERIAL_OVERRUN_PROTECTION)
-    safe_delay(ms);
-  #else
-    UNUSED(ms);
-  #endif
-}
+#if ENABLED(SERIAL_OVERRUN_PROTECTION)
+  void serial_delay(const millis_t ms);
+#else
+  inline void serial_delay(const millis_t) {}
+#endif
 
 #if GRID_MAX_POINTS_X && GRID_MAX_POINTS_Y
 

Marlin/src/feature/bedlevel/ubl/ubl.cpp

 
   unified_bed_leveling ubl;
 
+  #include "../../../MarlinCore.h"
+
   #include "../../../module/configuration_store.h"
   #include "../../../module/planner.h"
   #include "../../../module/motion.h"
    *   4: Compact Human-Readable
    */
   void unified_bed_leveling::display_map(const int map_type) {
-    #if HAS_AUTO_REPORTING || ENABLED(HOST_KEEPALIVE_FEATURE)
-      suspend_auto_report = true;
-    #endif
+    const bool was = gcode.set_autoreport_paused(true);
 
     constexpr uint8_t eachsp = 1 + 6 + 1,                           // [-3.567]
                       twixt = eachsp * (GRID_MAX_POINTS_X) - 9 * 2; // Leading 4sp, Coordinates 9sp each
       SERIAL_EOL();
     }
 
-    #if HAS_AUTO_REPORTING || ENABLED(HOST_KEEPALIVE_FEATURE)
-      suspend_auto_report = false;
-    #endif
+    set_gcode.set_autoreport_paused(was);
   }
 
   bool unified_bed_leveling::sanity_check() {

Marlin/src/gcode/gcode.cpp

   #include "../feature/cancel_object.h"
 #endif
 
-#include "../MarlinCore.h" // for idle() and suspend_auto_report
+#include "../MarlinCore.h" // for idle()
 
 millis_t GcodeSuite::previous_move_ms;
 
   | (ar_init.e ? _BV(REL_E) : 0)
 );
 
+#if HAS_AUTO_REPORTING || ENABLED(HOST_KEEPALIVE_FEATURE)
+  bool GcodeSuite::autoreport_paused; // = false
+#endif
+
 #if ENABLED(HOST_KEEPALIVE_FEATURE)
   GcodeSuite::MarlinBusyState GcodeSuite::busy_state = NOT_BUSY;
   uint8_t GcodeSuite::host_keepalive_interval = DEFAULT_KEEPALIVE_INTERVAL;
   void GcodeSuite::host_keepalive() {
     const millis_t ms = millis();
     static millis_t next_busy_signal_ms = 0;
-    if (!suspend_auto_report && host_keepalive_interval && busy_state != NOT_BUSY) {
+    if (!autoreport_paused && host_keepalive_interval && busy_state != NOT_BUSY) {
       if (PENDING(ms, next_busy_signal_ms)) return;
       switch (busy_state) {
         case IN_HANDLER:

Marlin/src/gcode/gcode.h

     process_subcommands_now_P(G28_STR);
   }
 
+  #if HAS_AUTO_REPORTING || ENABLED(HOST_KEEPALIVE_FEATURE)
+    static bool autoreport_paused;
+    static inline bool set_autoreport_paused(const bool p) {
+      const bool was = autoreport_paused;
+      autoreport_paused = p;
+      return was;
+    }
+  #else
+    static constexpr bool autoreport_paused = false;
+    static inline bool set_autoreport_paused(const bool) { return false; }
+  #endif
+
   #if ENABLED(HOST_KEEPALIVE_FEATURE)
     /**
      * States for managing Marlin and host communication