From 73ac8ba1975a3af4cf7cb42594e864bf3e2a589b Mon Sep 17 00:00:00 2001
From: Michael Steenbeek <1478678+Gymnasiast@users.noreply.github.com>
Date: Wed, 26 Feb 2025 21:56:32 +0100
Subject: [PATCH] Fix #4225: Ride Construction window offers non-existent
 banked sloped to level curve

---
 distribution/changelog.txt                   | 1 +
 src/openrct2-ui/windows/RideConstruction.cpp | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/distribution/changelog.txt b/distribution/changelog.txt
index 8242898ac3..93c27134c3 100644
--- a/distribution/changelog.txt
+++ b/distribution/changelog.txt
@@ -1,5 +1,6 @@
 0.4.21 (in development)
 ------------------------------------------------------------------------
+- Fix: [#4225] Ride Construction window offers non-existent banked sloped to level curve.
 
 0.4.20 (2025-02-25)
 ------------------------------------------------------------------------
diff --git a/src/openrct2-ui/windows/RideConstruction.cpp b/src/openrct2-ui/windows/RideConstruction.cpp
index 772e70ac37..5b89937260 100644
--- a/src/openrct2-ui/windows/RideConstruction.cpp
+++ b/src/openrct2-ui/windows/RideConstruction.cpp
@@ -669,6 +669,12 @@ namespace OpenRCT2::Ui::Windows
                 {
                     disabledWidgets |= (1uLL << WIDX_CHAIN_LIFT);
                 }
+                // Ensures that you can build an "unbanking turn", but not select a turn that start banked and
+                // turns to level (as that does not exist).
+                if (_currentTrackRollEnd != TrackRoll::None && _currentTrackPitchEnd != TrackPitch::None)
+                {
+                    disabledWidgets |= (1uLL << WIDX_LEVEL);
+                }
             }
             if (_currentTrackPitchEnd == TrackPitch::Up90 || _previousTrackPitchEnd == TrackPitch::Up90)
             {