Apply Matthias Luescher patch trevorr#38 - 'Be more careful about des…

…troying projects'

Signed-off-by: Július Adam <adam@elcom.sk>

Vss2Git/VssPathMapper.cs

@@ -547,10 +547,9 @@ public VssProjectInfo MoveProjectTo(VssItemName project, VssItemName subproject,
                         subprojectInfo.Parent = parentInfo;
                     }
                 }
-                else
+                else if (IsInMappedSet(newParentSpec))
                 {
                     // if resolution fails, the target project has been destroyed
-                    // or is outside the set of projects being mapped
                     subprojectInfo.Destroyed = true;
                 }
             }
@@ -585,6 +584,24 @@ private VssFileInfo GetOrCreateFile(VssItemName name)
             return fileInfo;
         }
 
+        private bool IsInMappedSet(string projectSpec)
+        {
+            if (!projectSpec.StartsWith("$/"))
+            {
+                throw new ArgumentException("Project spec must start with $/", "projectSpec");
+            }
+
+            foreach (var rootInfo in rootInfos.Values)
+            {
+                if (projectSpec.StartsWith(rootInfo.OriginalVssPath))
+                {
+                    return true;
+                }
+            }
+
+            return false;
+        }
+
         private VssProjectInfo ResolveProjectSpec(string projectSpec)
         {
             if (!projectSpec.StartsWith("$/"))