Thread:Extension talk:WYSIWYG/Drag and drop or cut and paste alter links/reply

It seems to work as you have descriped. Workaround is to copy-paste in wikitext mode.

I wonder if copy-paste in wysiwyg takes place only in CKeditor, if it does then problem could be with it's clipboard plugin. I tried to disable clipboard plugin with no success, it seems to be integrated with the build of that download package (to disable it requires too much work just for sake of test).

I would quess plugin does not know that behind we have wysiwyg editor and paste should not interfere with contents of data at all. I tired to trace html contents of the page after paste (before save) when everything looks like ok on page (links have been converted to external links already now), but I could not find out the contents of html code at that point. After saving the page, proper formats of element is anyway completely lost. I suspect paste changes or perhaps strips attributes of elements so that they are not compatible to wysiwyg anymore.