lfottaviano/emesene — comment on commit 6454d3ab0e97dd6884bc97bf3b53e0096a63aca3
File: emesene/gui/gtkui/ConversationManager.py line 76
By c10ud:

i haven't try this (not at home) but this will close the current tab if we middle click in every space contained in the gtk.notebook, right? so you can't actually close a non-focused tab