[WIP] Addressing vehicle's diagonal walls

src/vehicle.cpp

@@ -4814,3 +4814,13 @@ bool vehicle_part_with_feature_range<vpart_bitflags>::matches( const size_t part
            ( !( part_status_flag::available & required_ ) || vp.is_available() ) &&
            ( !( part_status_flag::enabled & required_ ) || vp.enabled );
 }
+
+sentinel_part::sentinel_part(vehicle_part* org,point p) : vehicle_part(*org)
+{
+    this->original=org;
+    mount=p;
+}
+sentinel_part::~sentinel_part(){
+    mount=original->mount;
+    *original = (vehicle_part)*this;
+}

src/vehicle.h

@@ -375,8 +375,10 @@ struct vehicle_part {
          * this part.
          */
         item_group::ItemList pieces_for_broken_part() const;
+
 };
 
+
 class turret_data
 {
         friend vehicle;
@@ -1525,4 +1527,18 @@ class vehicle
         mutable point mass_center_no_precalc;
 };
 
+/**
+ * Sentinel Parts that is used to block diagnal openings created when vehicles are at an angle.
+ * The sentinel_part serves as a special type of vehicle_part with a specific purpose of being used only to block passage 'through' the walls of the vehicle.
+ * It is designed to be dynamically created on a vehicle_part*, with the constructor copying over the value from the original, and removed when nolonger needed with the constructor who also takes care of the transfer of datasets.
+ */
+struct sentinel_part : public vehicle_part
+{
+    private:
+    vehicle_part* original;
+    public:
+    sentinel_part()=delete;
+    sentinel_part(vehicle_part* org,point p);
+    ~sentinel_part();
+};
 #endif