--- file_not_specified_in_diff	
+++ file_not_specified_in_diff	
@@ -, +, @@ 
--- scid_vs_pc-4.6/src/tkscid.cpp.orig
+++ scid_vs_pc-4.6/src/tkscid.cpp
@@ -10887,11 +10887,11 @@ 
           }
         }
 
-        if (str1 && strIsPrefix (prefix, str1)) {
+        if (str1 == "" && strIsPrefix (prefix, str1)) {
             Tcl_AppendElement (ti, str1);
             str1[0]=0;
         }
-        if (str2 && strIsPrefix (prefix, str2)) {
+        if (str2 == "" && strIsPrefix (prefix, str2)) {
             Tcl_AppendElement (ti, str2);
             str2[0]=0;
         }