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KDE can, most of the code is there for that, just look at the plasmoid manager in 4.4+. It just need to be adapted to do that. Some earlier version of Gnome3 could, but it was dropped. AwesomeWM can too, I have this feature right now in front of me, but it take a little skill to get what you want. It's more of a Do it Yourself WM than a ready out of the box one. But it is very flexible and is very easy to extend (no recompilation or nothing, just add few line in the config file to describe what you want to do and it will work. The config file is basically part of the source code, so the possibilities are unlimited.
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