1 files changed, 9 insertions, 0 deletions
diff --git a/src/terraform_gui.cpp b/src/terraform_gui.cpp
index 98f5a3fcc..b45a0e9a1 100644
--- a/src/terraform_gui.cpp
+++ b/src/terraform_gui.cpp
@@ -616,6 +616,15 @@ static void ResetLandscapeConfirmationCallback(Window *w, bool confirmed)
 	}
 }
 
+/**
+ * Checks whether we are currently dragging diagonally.
+ * @returns True iff we are selecting a diagonal rectangle for an action that supports it, otherwise false.
+ */
+bool IsDraggingDiagonal()
+{
+	return false;
+}
+
 struct ScenarioEditorLandscapeGenerationWindow : Window {
 	ScenarioEditorLandscapeGenerationWindow(const WindowDesc *desc, WindowNumber window_number) : Window()
 	{