Fix Hotend-abort-on-idle Check (#21535)

Marlin/src/feature/hotend_idle.cpp

@@ -35,6 +35,7 @@
 #include "../module/temperature.h"
 #include "../module/motion.h"
 #include "../lcd/ultralcd.h"
+#include "../module/planner.h"
 
 extern HotendIdleProtection hotend_idle;
 
@@ -43,7 +44,8 @@ millis_t HotendIdleProtection::next_protect_ms = 0;
 void HotendIdleProtection::check_hotends(const millis_t &ms) {
   bool do_prot = false;
   HOTEND_LOOP() {
-    if (thermalManager.degHotend(e) >= HOTEND_IDLE_MIN_TRIGGER) {
+    const bool busy = (TERN0(HAS_RESUME_CONTINUE, wait_for_user) || planner.has_blocks_queued());
+    if (thermalManager.degHotend(e) >= HOTEND_IDLE_MIN_TRIGGER && !busy) {
       do_prot = true; break;
     }
   }