Prevent loop of "fixed fail to feed - found the gun failed to feed"

src/activity_actor.cpp

@@ -353,6 +353,8 @@ bool aim_activity_actor::check_gun_ability_to_shoot( Character &who, item &it )
                                    _( "Your %s has some mechanical malfunction.  You tried to quickly fix it, and it works now!" ),
                                    it.tname() );
             it.faults.erase( faults::random_of_type_item_has( it, gun_mechanical_simple ) );
+            islot_gun &firing = *it.type->gun;
+            firing.u_know_round_in_chamber = true;
         } else {
             who.add_msg_if_player( m_warning,
                                    _( "Your %s has some mechanical malfunction.  You tried to quickly fix it, but failed!" ),

src/itype.h

@@ -792,6 +792,11 @@ struct islot_gun : common_ranged_data {
     */
     double gun_jam_mult = 1;
 
+    /**
+    *  character spend time to repair failure to feed, so if true, it is guarantee the round is in the chamber
+    */
+    bool u_know_round_in_chamber = false;
+
     std::map<ammotype, std::set<itype_id>> cached_ammos;
 
     /**

src/ranged.cpp

@@ -752,7 +752,7 @@ bool Character::handle_gun_damage( item &it )
         return false;
 
         // Chance for the weapon to suffer a failure, caused by the magazine size, quality, or condition
-    } else if( x_in_y( jam_chance, 1 ) &&
+    } else if( x_in_y( jam_chance, 1 ) && !firing.u_know_round_in_chamber &&
                faults::get_random_of_type_item_can_have( it, gun_mechanical_simple ) != fault_id::NULL_ID() ) {
         add_msg_player_or_npc( _( "Your %s didn't load into the chamber!" ),
                                _( "<npcname>'s %s didn't load into the chamber!" ),
@@ -853,6 +853,12 @@ bool Character::handle_gun_damage( item &it )
         // Don't increment until after the message
         it.inc_damage();
     }
+
+    if( firing.u_know_round_in_chamber ) {
+        islot_gun gun = *it.type->gun;
+        gun.u_know_round_in_chamber = false;
+    }
+
     return true;
 }