Encode HTML entities for inline forwards in text

Fixes #2411

SoObjects/Mailer/NSString+Mail.m

@@ -613,8 +613,7 @@ convertChars (const char *oldString, unsigned int oldLength,
   unsigned int newLength;
 
   utf8String = [self UTF8String];
-  newString = convertChars (utf8String, strlen (utf8String),
-                            &newLength);
+  newString = convertChars (utf8String, strlen (utf8String), &newLength);
   convertedString = [[NSString alloc] initWithBytes: newString
                                              length: newLength
                                            encoding: NSUTF8StringEncoding];

SoObjects/Mailer/SOGoMailObject+Draft.m

@@ -94,7 +94,7 @@
   if (html && !htmlComposition)
     rc = [raw htmlToText];
   else if (!html && htmlComposition)
-    rc = [raw stringByConvertingCRLNToHTML];
+    rc = [[raw stringByEscapingHTMLString] stringByConvertingCRLNToHTML];
   else
     rc = raw;
 
@@ -171,8 +171,8 @@
     = [NSArray arrayWithObjects: @"text/plain", @"text/html", nil];
   keys = [NSMutableArray array];
   [self addRequiredKeysOfStructure: [self bodyStructure]
-	path: @"" toArray: keys acceptedTypes: acceptedTypes
-        withPeek: NO];
+                              path: @"" toArray: keys acceptedTypes: acceptedTypes
+                          withPeek: NO];
 
   return [self _contentForEditingFromKeys: keys];
 }