bugfix GetSelectionLength - now return 1 less due to \0 handling

Author: kbilsted

Visual Studio Project Template C#/PluginInfrastructure/ScintillaGateway.cs

@@ -25,14 +25,17 @@ public class ScintillaGateway : IScintillaGateway
 
         private readonly IntPtr scintilla;
 
+        public static readonly int LengthZeroTerminator = "\0".Length;
+
+
         public ScintillaGateway(IntPtr scintilla)
         {
             this.scintilla = scintilla;
         }
 
         public int GetSelectionLength()
         {
-            var selectionLength = (int)Win32.SendMessage(scintilla, SciMsg.SCI_GETSELTEXT, Unused, Unused);
+            var selectionLength = (int) Win32.SendMessage(scintilla, SciMsg.SCI_GETSELTEXT, Unused, Unused) - LengthZeroTerminator;
             return selectionLength;
         }