Mac (Cocoa) Omnibox: Force text field to LTR context if it is a URL.

chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.h"
 
 #include <Carbon/Carbon.h>  // kVK_Return
 
 #include "base/mac/foundation_util.h"
 #include "base/memory/ptr_util.h"
@@ skipping 544 matching lines @@
                            range:NSMakeRange(0, [attributedString length])];
 
   // Make a paragraph style locking in the standard line height as the maximum,
   // otherwise the baseline may shift "downwards".
   base::scoped_nsobject<NSMutableParagraphStyle> paragraph_style(
       [[NSMutableParagraphStyle alloc] init]);
   CGFloat line_height = [[field_ cell] lineHeight];
   [paragraph_style setMaximumLineHeight:line_height];
   [paragraph_style setMinimumLineHeight:line_height];
   [paragraph_style setLineBreakMode:NSLineBreakByTruncatingTail];
+  // If this is a URL, set the top-level paragraph direction to LTR (avoids RTL
+  // characters from making the URL render from right to left, as per RFC 3987
+  // Section 4.1).
+  if (model()->CurrentTextIsURL())
+    [paragraph_style setBaseWritingDirection:NSWritingDirectionLeftToRight];
   [attributedString addAttribute:NSParagraphStyleAttributeName
                            value:paragraph_style
                            range:NSMakeRange(0, [attributedString length])];
 }
 
 void OmniboxViewMac::ApplyTextAttributes(
     const base::string16& display_text,
     NSMutableAttributedString* attributedString) {
   NSUInteger as_length = [attributedString length];
   if (as_length == 0) {
@@ skipping 582 matching lines @@
                               display_text);
   NSDictionary* notification_info = @{
       NSAccessibilityAnnouncementKey : announcement,
       NSAccessibilityPriorityKey :     @(NSAccessibilityPriorityHigh)
   };
   NSAccessibilityPostNotificationWithUserInfo(
       [field_ window],
       NSAccessibilityAnnouncementRequestedNotification,
       notification_info);
 }