Fix open HTML with an external program

HTML emails can't be opened because they are not written to disk. This
fixes it by writing HTML parts of the email unconditionally to disk and
adds a '.html' file extension if the part is of type HTML. This resolves
Issue #94

kmail/kmreaderwin.cpp

@@ -1775,8 +1775,12 @@ TQString KMReaderWin::writeMessagePartToTempFile( KMMessagePart* aMsgPart,
   int slashPos = fileName.findRev( '/' );
   if( -1 != slashPos )
     fileName = fileName.mid( slashPos + 1 );
-  if( fileName.isEmpty() )
+  if( fileName.isEmpty() ) {
     fileName = "unnamed";
+    // Save html emails with extension
+    if ( aMsgPart->subtype() == DwMime::kSubtypeHtml )
+      fileName += ".html";
+  }
   fname += "/" + fileName;
 
   TQByteArray data = aMsgPart->bodyDecodedBinary();
@@ -3042,10 +3046,15 @@ TQString KMReaderWin::renderAttachments(partNode * node, const TQColor &bgColor
     }
   } else {
     partNode::AttachmentDisplayInfo info = node->attachmentDisplayInfo();
+
+    // Write HTML parts and attachments to disk to allow them to be opened
+    bool writePartToDisk = info.displayInHeader || node->msgPart().subtype() == DwMime::kSubtypeHtml;
+    if ( writePartToDisk )
+        TQString fileName = writeMessagePartToTempFile( &node->msgPart(), node->nodeId() );
+
     if ( info.displayInHeader ) {
       html += "<div style=\"float:left;\">";
       html += TQString::fromLatin1( "<span style=\"white-space:nowrap; border-width: 0px; border-left-width: 5px; border-color: %1; 2px; border-left-style: solid;\">" ).arg( bgColor.name() );
-      TQString fileName = writeMessagePartToTempFile( &node->msgPart(), node->nodeId() );
       TQString href = node->asHREF( "header" );
       html += TQString::fromLatin1( "<a href=\"" ) + href +
               TQString::fromLatin1( "\">" );