Ext UI pause state handling

Marlin/Configuration_adv.h

@@ -2422,6 +2422,8 @@
   #define PAUSE_PARK_NOZZLE_TIMEOUT           45  // (seconds) Time limit before the nozzle is turned off for safety.
   #define FILAMENT_CHANGE_ALERT_BEEPS         10  // Number of alert beeps to play when a response is needed.
   #define PAUSE_PARK_NO_STEPPER_TIMEOUT           // Enable for XYZ steppers to stay powered on during filament change.
+  #define FILAMENT_CHANGE_RESUME_ON_INSERT        // Automatically continue / load filament when runout sensor is made again
+  #define FILAMENT_CHANGE_FAST_RESUME             // Reduce number of waits by not prompting again post timeout before continuing
 
   //#define PARK_HEAD_ON_PAUSE                    // Park the nozzle during pause and filament change.
   //#define HOME_BEFORE_FILAMENT_CHANGE           // If needed, home before parking for filament change

Marlin/src/feature/pause.cpp

@@ -201,6 +201,9 @@ bool load_filament(const_float_t slow_load_length/*=0*/, const_float_t fast_load
 
     while (wait_for_user) {
       impatient_beep(max_beep_count);
+      #if BOTH(FILAMENT_CHANGE_RESUME_ON_INSERT, FILAMENT_RUNOUT_SENSOR)
+        if (READ(FIL_RUNOUT1_PIN) != FIL_RUNOUT1_STATE) wait_for_user = false;
+      #endif
       idle_no_sleep();
     }
   }
@@ -538,7 +541,7 @@ void wait_for_confirmation(const bool is_reload/*=false*/, const int8_t max_beep
       HOTEND_LOOP() thermalManager.heater_idle[e].start(nozzle_timeout);
       TERN_(HOST_PROMPT_SUPPORT, host_prompt_do(PROMPT_USER_CONTINUE, GET_TEXT(MSG_REHEATDONE), CONTINUE_STR));
       TERN_(EXTENSIBLE_UI, ExtUI::onUserConfirmRequired_P(GET_TEXT(MSG_REHEATDONE)));
-      wait_for_user = true;
+      IF_DISABLED(FILAMENT_CHANGE_FAST_RESUME, wait_for_user = true);
       nozzle_timed_out = false;
 
       first_impatient_beep(max_beep_count);

Marlin/src/lcd/extui/ui_api.cpp

@@ -1037,6 +1037,7 @@ namespace ExtUI {
 
   #if M600_PURGE_MORE_RESUMABLE
     void setPauseMenuResponse(PauseMenuResponse response) { pause_menu_response = response; }
+    PauseMode getPauseMode() { return pause_mode; }
   #endif
 
   void printFile(const char *filename) {

Marlin/src/lcd/extui/ui_api.h

@@ -234,6 +234,7 @@ namespace ExtUI {
 
   #if M600_PURGE_MORE_RESUMABLE
     void setPauseMenuResponse(PauseMenuResponse);
+    PauseMode getPauseMode();
   #endif
 
   #if ENABLED(LIN_ADVANCE)

Marlin/src/lcd/marlinui.cpp

@@ -1692,8 +1692,6 @@ constexpr uint8_t epps = ENCODER_PULSES_PER_STEP;
     const PauseMode mode/*=PAUSE_MODE_SAME*/,
     const uint8_t extruder/*=active_extruder*/
   ) {
-    if (mode == PAUSE_MODE_SAME)
-      return;
     pause_mode = mode;
     switch (message) {
       case PAUSE_MESSAGE_PARKING:  ExtUI::onUserConfirmRequired_P(GET_TEXT(MSG_PAUSE_PRINT_PARKING));
@@ -1703,11 +1701,7 @@ constexpr uint8_t epps = ENCODER_PULSES_PER_STEP;
       case PAUSE_MESSAGE_INSERT:   ExtUI::onUserConfirmRequired_P(GET_TEXT(MSG_FILAMENT_CHANGE_INSERT));
       case PAUSE_MESSAGE_LOAD:     ExtUI::onUserConfirmRequired_P(GET_TEXT(MSG_FILAMENT_CHANGE_LOAD));
       case PAUSE_MESSAGE_PURGE:
-        #if ENABLED(ADVANCED_PAUSE_CONTINUOUS_PURGE)
-          ExtUI::onUserConfirmRequired_P(GET_TEXT(MSG_FILAMENT_CHANGE_CONT_PURGE));
-        #else
-          ExtUI::onUserConfirmRequired_P(GET_TEXT(MSG_FILAMENT_CHANGE_PURGE));
-        #endif
+        ExtUI::onUserConfirmRequired_P(GET_TEXT(TERN(ADVANCED_PAUSE_CONTINUOUS_PURGE, MSG_FILAMENT_CHANGE_CONT_PURGE, MSG_FILAMENT_CHANGE_PURGE)));
       case PAUSE_MESSAGE_RESUME:   ExtUI::onUserConfirmRequired_P(GET_TEXT(MSG_FILAMENT_CHANGE_RESUME));
       case PAUSE_MESSAGE_HEAT:     ExtUI::onUserConfirmRequired_P(GET_TEXT(MSG_FILAMENT_CHANGE_HEAT));
       case PAUSE_MESSAGE_HEATING:  ExtUI::onUserConfirmRequired_P(GET_TEXT(MSG_FILAMENT_CHANGE_HEATING));