Fix #7854: Cannot build custom Spiral RC; dummy entries in track designs list (#10814)

distribution/changelog.txt

@@ -10,6 +10,8 @@
 - Change: [#1164] Use available translations for shortcut key bindings.
 - Fix: [#5249] No collision detection when building ride entrance at heights > 85.5m.
 - Fix: [#7784] Vehicle tab takes 1st car colour instead of tab_vehicle's colour.
+- Fix: [#7854] Cannot build a custom spiral roller coaster design.
+- Fix: [#7854] Empty entries in spiral roller coaster designs list.
 - Fix: [#8875] RCT1 competition scenarios are classified incorrectly.
 - Fix: [#10176] Mistake in the sprite for the land tool's 6x6 grid.
 - Fix: [#10196] Doors unable to be placed at end of track corners.

src/openrct2-ui/windows/TrackList.cpp

@@ -239,13 +239,6 @@ static void window_track_list_close(rct_window* w)
  */
 static void window_track_list_select(rct_window* w, int32_t listIndex)
 {
-    // Displays a message if the ride can't load, fix #4080
-    if (_loadedTrackDesign == nullptr)
-    {
-        context_show_error(STR_CANT_BUILD_PARK_ENTRANCE_HERE, STR_TRACK_LOAD_FAILED_ERROR);
-        return;
-    }
-
     audio_play_sound(SoundId::Click1, 0, w->x + (w->width / 2));
     if (!(gScreenFlags & SCREEN_FLAGS_TRACK_MANAGER))
     {
@@ -258,7 +251,14 @@ static void window_track_list_select(rct_window* w, int32_t listIndex)
         listIndex--;
     }
 
-    if (_loadedTrackDesign && (_loadedTrackDesign->track_flags & TRACK_DESIGN_FLAG_SCENERY_UNAVAILABLE))
+    // Displays a message if the ride can't load, fix #4080
+    if (_loadedTrackDesign == nullptr)
+    {
+        context_show_error(STR_CANT_BUILD_PARK_ENTRANCE_HERE, STR_TRACK_LOAD_FAILED_ERROR);
+        return;
+    }
+
+    if (_loadedTrackDesign->track_flags & TRACK_DESIGN_FLAG_SCENERY_UNAVAILABLE)
     {
         gTrackDesignSceneryToggle = true;
     }

src/openrct2/ride/TrackDesignRepository.cpp

@@ -35,7 +35,7 @@ struct TrackRepositoryItem
 {
     std::string Name;
     std::string Path;
-    uint8_t RideType = 0;
+    uint8_t RideType = RIDE_TYPE_NULL;
     std::string ObjectEntry;
     uint32_t Flags = 0;
 };