From 281cf137f4af63cc4c20b81d1e2b8b4f647c1c05 Mon Sep 17 00:00:00 2001
From: Henry Cheng <39224097+jazzysoggy@users.noreply.github.com>
Date: Sun, 31 Jul 2022 17:51:08 -0400
Subject: [PATCH] Fix #17639: Duplicate special elements when building upside
 down

---
 distribution/changelog.txt                   | 1 +
 src/openrct2-ui/windows/RideConstruction.cpp | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/distribution/changelog.txt b/distribution/changelog.txt
index f9c057fefb..831e51702a 100644
--- a/distribution/changelog.txt
+++ b/distribution/changelog.txt
@@ -25,6 +25,7 @@
 - Fix: [#17542] Stalls will autorotate towards paths outside the park.
 - Fix: [#17553] Crash when moving invention list items to empty list.
 - Fix: [#17605] Crash when opening parks which have had objects removed externally.
+- Fix: [#17639] When building upside down, the special elements list contains many items twice (original bug).
 
 0.4.1 (2022-07-04)
 ------------------------------------------------------------------------
diff --git a/src/openrct2-ui/windows/RideConstruction.cpp b/src/openrct2-ui/windows/RideConstruction.cpp
index e34a4b06a1..a44c9e56cb 100644
--- a/src/openrct2-ui/windows/RideConstruction.cpp
+++ b/src/openrct2-ui/windows/RideConstruction.cpp
@@ -2108,7 +2108,8 @@ public:
                 }
             }
 
-            if (bank == TRACK_BANK_UPSIDE_DOWN && bank != _previousTrackBankEnd)
+            if ((bank == TRACK_BANK_UPSIDE_DOWN || ted.Definition.bank_end == TRACK_BANK_UPSIDE_DOWN)
+                && bank != _previousTrackBankEnd)
                 continue;
 
             _currentPossibleRideConfigurations[currentPossibleRideConfigurationIndex] = trackType;