I second the point of view of many that mime-type should be a guidance.
It is a good idea to highlight the applications that recognize the mime-type of what you're dragging, but it should not block you from dropping it on any application that did no declare this mime-type.
Will the 12.04 LTS really lack this basic Drag and drop feature? /bugs.launchpad .net/ayatana- design/ +bug/754580 (can not move firefox tabs betwwen firefox windows) /bugs.launchpad .net/ayatana- design/ +bug/607796 (window applications do not spread when dragging a selection on it).
See also some related issues :
https:/
https:/
I second the point of view of many that mime-type should be a guidance.
It is a good idea to highlight the applications that recognize the mime-type of what you're dragging, but it should not block you from dropping it on any application that did no declare this mime-type.