This is a GNOME Shell extension where you can pick your own "hot corners" for toggling the overview, or for running custom applications. You can also change the "hot corner" for the message tray. When you install this extension the "hot corner" that toggles the overview moves to the bottom-left corner, to change it, go to http://euhiemf.github.io/Hot-Corn-Dog/#customizationand check out the instructions on how to do it.
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