Copying from English Wikipedia:
Okay, this one is probably quite tricky: When editing the source code, if an edit conflict arises, you can simply hit the back button, copy the code, and paste it into the updated version. However, with the Visual Editor, this is no longer possible. The content goes away, so you have to re-add it all, which is a huge pain if it involves references and other templates.--¿3family6 contribs 18:25, 3 July 2013 (UTC)
Version: unspecified
Severity: normal
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=47779
https://bugzilla.wikimedia.org/show_bug.cgi?id=52519
https://bugzilla.wikimedia.org/show_bug.cgi?id=56465