
When middle-clicking an app icon on the Dash, it will always try to open a new window of that app, even if the app doesn't support multiple windows. Meanwhile, Ctrl+click on an app will only open a new window if the app allows it. This change prevents middle-clicks on app icons from opening new windows for apps without multi-window support. Closes: https://gitlab.gnome.org/GNOME/gnome-shell/issues/316