Created attachment 704594 [details] example.eml User Agent: Mozilla/5.0 (Windows NT 5.1; rv:21.0) Gecko/20130118 Firefox/21.0 Build ID: 20130118213347 Steps to reproduce: Look at an E-Mail or Newsgroup Article that has an Subject with mixed ASCII and MIME words. Example: mozilla.test news://news.mozilla.org:119/mLCdneUfb6GbG2DNnZ2dnUVZ_vadnZ2d@mozilla.org RAW Subject: AAA =?UTF-8?Q?bbb?= CCC =?UTF-8?Q?ddd?= EEE =?UTF-8?Q?fff?= GGG Actual results: Subject is displayed as: AAA CCC EEE bbbdddfff GGG Expected results: Should be displayed as: AAA bbb CCC ddd EEE fff GGG
This Bug is caused by attachment 695139 [details] [diff] [review] from Bug 493544 Tested on TB and SM by backing out that patch.
@ZaneUJi: Could you move your patches from bug 493544?
Created attachment 705313 [details] [diff] [review] Test case
Created attachment 705314 [details] [diff] [review] Patch
https://hg.mozilla.org/integration/mozilla-inbound/rev/2c4a8bdb41eb I'll land the mailnews patch once this is merged over to m-c.