[MailNews] Allow shift-clicking on Edit As New to edit a message as plaintext.

Ref: BZ 731688

mailnews/compose/public/nsIMsgComposeParams.idl

@@ -39,6 +39,12 @@ interface nsIMsgCompType {
      */
     const long Redirect                 = 14;
 
+    /**
+     * Used to compose a new message from an existing message. Links
+     * are sanitized since the message could be from external sources.
+     */
+    const long EditAsNew                = 15;
+
     /**
      * Add this value to a reply type to suppress quoting the current selection
      * which may not belong to the message being replied to.

mailnews/compose/src/nsMsgCompose.cpp

@@ -1070,7 +1070,8 @@ nsMsgCompose::Initialize(nsIMsgComposeParams *aParams,
     // by checking the identity prefs - but don't clobber the values for
     // drafts and templates as they were set up already by mime when
     // initializing the message.
-    if (m_identity && draftId.IsEmpty() && type != nsIMsgCompType::Template)
+    if (m_identity && draftId.IsEmpty() && type != nsIMsgCompType::Template
+        && type != nsIMsgCompType::EditAsNew)
     {
       bool requestReturnReceipt = false;
       rv = m_identity->GetRequestReturnReceipt(&requestReturnReceipt);
@@ -4766,6 +4767,7 @@ nsMsgCompose::BuildBodyMessageAndSignature()
     case nsIMsgCompType::Draft :
     case nsIMsgCompType::Template :
     case nsIMsgCompType::Redirect :
+    case nsIMsgCompType::EditAsNew :
       addSignature = false;
       break;
 

mailnews/compose/src/nsMsgComposeService.cpp

@@ -387,14 +387,22 @@ nsMsgComposeService::OpenComposeWindow(const char *msgComposeWindowURL, nsIMsgDB
   /* Actually, the only way to implement forward inline is to simulate a template message.
      Maybe one day when we will have more time we can change that
   */
-  if (type == nsIMsgCompType::ForwardInline || type == nsIMsgCompType::Draft || type == nsIMsgCompType::Template
+  if (type == nsIMsgCompType::ForwardInline || type == nsIMsgCompType::Draft ||
-    || type == nsIMsgCompType::ReplyWithTemplate || type == nsIMsgCompType::Redirect)
+      type == nsIMsgCompType::Template || 
+      type == nsIMsgCompType::ReplyWithTemplate || 
+      type == nsIMsgCompType::Redirect ||
+      type == nsIMsgCompType::EditAsNew)
   {
     nsAutoCString uriToOpen(originalMsgURI);
     uriToOpen += (uriToOpen.FindChar('?') == kNotFound) ? '?' : '&';
     uriToOpen.Append("fetchCompleteMessage=true");
+    // The compose type that gets transmitted to a compose window open in mime
+    // is communicated using url query parameters here.
+
     if (type == nsIMsgCompType::Redirect)
       uriToOpen.Append("&redirect=true");
+    else if (type == nsIMsgCompType::EditAsNew)
+      uriToOpen.Append("&editasnew=true");
 
     return LoadDraftOrTemplate(uriToOpen, type == nsIMsgCompType::ForwardInline || type == nsIMsgCompType::Draft ?
                                nsMimeOutput::nsMimeMessageDraftOrTemplate : nsMimeOutput::nsMimeMessageEditorTemplate,

mailnews/mime/src/mimedrft.cpp

@@ -1087,6 +1087,33 @@ mime_insert_forwarded_message_headers(char            **body,
   }
 }
 
+static void
+convert_plaintext_body_to_html(char **body, uint32_t bodyLen)
+{
+  // We need to convert the plain/text to HTML in order to escape any HTML markup
+  char *escapedBody = MsgEscapeHTML(*body);
+  if (escapedBody)
+  {
+    PR_Free(*body);
+    *body = escapedBody;
+    bodyLen = strlen(*body);
+  }
+
+   // +13 chars for <pre> & </pre> tags and CRLF
+  uint32_t newbodylen = bodyLen + 14;
+  char* newbody = (char *)PR_MALLOC (newbodylen);
+  if (newbody)
+  {
+    *newbody = 0;
+    PL_strcatn(newbody, newbodylen, "<PRE>");
+    PL_strcatn(newbody, newbodylen, *body);
+    PL_strcatn(newbody, newbodylen, "</PRE>" CRLF);
+    PR_Free(*body);
+    *body = newbody;
+  }
+}
+
+
 static void
 mime_parse_stream_complete(nsMIMESession *stream)
 {
@@ -1415,28 +1442,8 @@ mime_parse_stream_complete(nsMIMESession *stream)
             {
               // ... but the message body is currently plain text.
 
-              //We need to convert the plain/text to HTML in order to escape any HTML markup
+              convert_plaintext_body_to_html(&body, bodyLen);
-              char *escapedBody = MsgEscapeHTML(body);
+	    }
-              if (escapedBody)
-              {
-                PR_Free(body);
-                body = escapedBody;
-                bodyLen = strlen(body);
-              }
-
-               //+13 chars for <pre> & </pre> tags and CRLF
-              uint32_t newbodylen = bodyLen + 14;
-              char* newbody = (char *)PR_MALLOC (newbodylen);
-              if (newbody)
-              {
-                *newbody = 0;
-                PL_strcatn(newbody, newbodylen, "<PRE>");
-                PL_strcatn(newbody, newbodylen, body);
-                PL_strcatn(newbody, newbodylen, "</PRE>" CRLF);
-                PR_Free(body);
-                body = newbody;
-              }
-            }
             // Body is now HTML, set the format too (so headers are inserted in
             // correct format).
             composeFormat = nsIMsgCompFormat::HTML;
@@ -1460,6 +1467,68 @@ mime_parse_stream_complete(nsMIMESession *stream)
 
       }
 
+      MSG_ComposeType msgComposeType = 0;  // Keep compilers happy.
+      if (mdd->format_out == nsMimeOutput::nsMimeMessageEditorTemplate)
+      {
+        if (PL_strstr(mdd->url_name, "&redirect=true"))
+          msgComposeType = nsIMsgCompType::Redirect;
+        else if (PL_strstr(mdd->url_name, "&editasnew=true"))
+          msgComposeType = nsIMsgCompType::EditAsNew;
+        else
+          msgComposeType = nsIMsgCompType::Template;
+      }
+
+      if (body && msgComposeType == nsIMsgCompType::EditAsNew)
+      {
+        // When editing as new, we respect the identities preferred format
+        // which can be overridden.
+        if (mdd->identity)
+        {
+          bool identityComposeHTML;
+          mdd->identity->GetComposeHtml(&identityComposeHTML);
+
+          if (composeFormat == nsIMsgCompFormat::HTML &&
+              identityComposeHTML == mdd->overrideComposeFormat)
+          {
+            // We we have HTML:
+            // If they want HTML and they want to override it (true == true)
+            // or they don't want HTML and they don't want to override it
+            // (false == false), then convert. Conversion happens below.
+            convertToPlainText = true;
+            composeFormat = nsIMsgCompFormat::PlainText;
+          }
+          else if (composeFormat == nsIMsgCompFormat::PlainText &&
+                   identityComposeHTML != mdd->overrideComposeFormat)
+          {
+            // We have plain text:
+            // If they want HTML and they don't want to override it (true != false)
+            // or they don't want HTML and they want to override it
+            // (false != true), then convert.
+            convert_plaintext_body_to_html(&body, bodyLen);
+            composeFormat = nsIMsgCompFormat::HTML;
+          }
+        }
+      }
+      else if (body && mdd->overrideComposeFormat &&
+               (msgComposeType == nsIMsgCompType::Template ||
+                !mdd->forwardInline)) // Draft processing.
+      {
+        // When using a template and overriding, the user gets the
+        // "other" format.
+        if (composeFormat == nsIMsgCompFormat::PlainText)
+        {
+          convert_plaintext_body_to_html(&body, bodyLen);
+          composeFormat = nsIMsgCompFormat::HTML;
+        }
+        else
+        {
+          // Conversion happens below.
+          convertToPlainText = true;
+          composeFormat = nsIMsgCompFormat::PlainText;
+        }
+      }
+
+
       // convert from UTF-8 to UTF-16
       if (body)
       {
@@ -1474,10 +1543,9 @@ mime_parse_stream_complete(nsMIMESession *stream)
       //
       if (mdd->format_out == nsMimeOutput::nsMimeMessageEditorTemplate)
       {
-        MSG_ComposeType msgComposeType = PL_strstr(mdd->url_name,
+        if (convertToPlainText)
-                                                   "&redirect=true") ?
+	  fields->ConvertBodyToPlainText();
-                                         nsIMsgCompType::Redirect :
+
-                                         nsIMsgCompType::Template;
         CreateTheComposeWindow(fields, newAttachData, msgComposeType,
                                composeFormat, mdd->identity,
                                mdd->originalMsgURI, mdd->origMsgHdr);
@@ -1505,6 +1573,8 @@ mime_parse_stream_complete(nsMIMESession *stream)
         }
         else
         {
+	  if (convertToPlainText)
+	    fields->ConvertBodyToPlainText();
           fields->SetDraftId(mdd->url_name);
           CreateTheComposeWindow(fields, newAttachData, nsIMsgCompType::Draft, composeFormat, mdd->identity, mdd->originalMsgURI, mdd->origMsgHdr);
         }