@heyimghab You can already do that. Just grab the previously dragged out tab (by the tab, not by the window bar) and drag it back 
Best posts made by daniek91
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Suggestions and feature requestsRE: Allow people to add back tabs to already existing windows
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Suggestions and feature requestsRE: Please either move or remove the "close other tab" function in the context menu.
@sapphiel did you figure out by now that you can simply close the tab by clicking on it with the middle mouse button?
Really handy! 