Single click to activate

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http://www.linuxquestions.org – A bit of a GTK+/Qt desktop consistency issue: Is it possible to make GTK+ apps open files on a single click? In Qt, item views have two separate concepts of "clicked" and "activated" (== double click by default). When you check the open files with single click box in KDE, it simply tells Qt to interpret a single click as "activated" in all apps. Also, single click to open is very convenient, but how do you select items easily? Especially, how do you easily deselect all? (HowTos)