I have this issue in mint18..!
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middle click on dock task bar icon open app twice
Status in Cairo-Dock Core:
$ cairo-dock -v
on archlinux in gnome-shell.
When I middle click on gnome-terminal (for example, other apps are same), two
new window of gnome-terminal is launched instead of one ( the correct behavior).
I think it is a regression from previous version. The debug output
(cairo-dock -l debug) is attached, I middle clicked gnome-terminal
launcher in the end of the debug logging.
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