Fixed the RTFD generation when the attachments do not have filenames. It is now possible to write RTFD documents with pasted images.

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/gui/trunk@22921 72102866-910b-0410-8b05-ffd578937521

TextConverters/RTF/RTFProducer.h

@@ -56,6 +56,7 @@
     to build the delta "*/
 
   BOOL _inlineGraphics; /*" Indicates if graphics should be inlined. "*/
+  int unnamedAttachmentCounter; /*" Count the number of unnamed attachments so we can name them uniquely "*/
 }
 
 + (NSData *)produceDataFrom: (NSAttributedString *)aText

TextConverters/RTF/RTFProducer.m

@@ -925,7 +925,15 @@
 
                   if (! attachmentFilename)
                     {
-                      attachmentFilename = @"unnamed";
+                      // If we do not have a proper filename, we set it here, incrementing
+                      // the number of unnamed attachment so we do not overwrite existing ones.
+
+                      // FIXME: setting the filename extension to tiff is not that great, but as
+                      // we anyway append \NeXTGraphic just after it makes sense... (without the
+                      // extension the file is not loaded) 
+
+                      attachmentFilename = [NSString stringWithFormat: @"__unnamed_file_%d.tiff", 
+                                             unnamedAttachmentCounter++];
                       [attachmentFileWrapper setPreferredFilename: 
                           attachmentFilename];
                     }