Display path for tiles overmap too, not just ascii

src/game.h

@@ -1154,6 +1154,9 @@ class game
         // show NPC pathfinding on overmap ui
         bool debug_pathfinding = false; // NOLINT(cata-serialize)
 
+        //Ugly kludge to pass info to tile overmaps
+        npc *follower_path_to_show = nullptr;
+
         /* tile overlays */
         // Toggle all other overlays off and flip the given overlay on/off.
         void display_toggle_overlay( action_id );

src/npctalk_funcs.cpp

@@ -407,7 +407,9 @@ void talk_function::goto_location( npc &p )
         add_msg( m_info, _( "That is not a valid destination for %s." ), p.disp_name() );
         return;
     }
+    g->follower_path_to_show = &p; // Necessary for overmap display in tiles version...
     ui::omap::display_npc_path( p.global_omt_location(), p.omt_path );
+    g->follower_path_to_show = nullptr;
     if( !query_yn( _( "Is this path and destination acceptable?" ) ) ) {
         p.goal = npc::no_goal_point;
         p.omt_path.clear();

src/sdltiles.cpp

@@ -979,6 +979,15 @@ void cata_tiles::draw_om( const point &dest, const tripoint_abs_omt &center_abs_
             }
         }
 
+        if( g->follower_path_to_show ) {
+            for( const tripoint_abs_omt &pos : g->follower_path_to_show->omt_path ) {
+                if( pos.z() == center_abs_omt.z() ) {
+                    draw_from_id_string( "highlight", global_omt_to_draw_position( pos ), 0, 0, lit_level::LIT,
+                                         false );
+                }
+            }
+        }
+
         // only draw in full tiles so it doesn't get cut off
         const std::optional<std::pair<tripoint_abs_omt, std::string>> mission_arrow =
                     get_mission_arrow( full_om_tile_area, center_abs_omt );