From 4ce26ad8fadf84b32c981a0f81d14314b7ea3ecf Mon Sep 17 00:00:00 2001
From: codeimp <codeimp@e0d998f2-2e9b-42fe-843d-47128df60a06>
Date: Sat, 3 Jan 2009 14:27:51 +0000
Subject: [PATCH] linedefs with backsides only after removing a sector will now
 be correctly flipped

---
 Source/BuilderModes/ClassicModes/SectorsMode.cs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Source/BuilderModes/ClassicModes/SectorsMode.cs b/Source/BuilderModes/ClassicModes/SectorsMode.cs
index 1f821447..88aba54f 100644
--- a/Source/BuilderModes/ClassicModes/SectorsMode.cs
+++ b/Source/BuilderModes/ClassicModes/SectorsMode.cs
@@ -850,6 +850,13 @@ namespace CodeImp.DoomBuilder.BuilderModes
 						}
 						else
 						{
+							// If the line only has a back side left, flip the line and sides
+							if((lines[i].Front == null) && (lines[i].Back != null))
+							{
+								lines[i].FlipVertices();
+								lines[i].FlipSidedefs();
+							}
+							
 							// Update sided flags
 							lines[i].ApplySidedFlags();
 						}