ckeditor/ckeditor-dev — pull request #53 by UberMeatShield (2013-08-27 20:58:54+00:00)
Title: Optional per menu prevent drag or drop configuration for floating panels.  #10373

Made some of the changes I believe you wanted in the valid rejection of:
https://github.com/ckeditor/ckeditor-dev/pull/52

Now when creating a panel you can provide prevent drag as a param. Panels that do not have this parameter can still drag and drop, tested on FF, Chrome, Safari.