Apparently xev shows several key strokes each time I press "Back" button _once_. FocusIn event, serial 31, synthetic NO, window 0x3e00001, mode NotifyGrab, detail NotifyPointer KeymapNotify event, serial 31, synthetic NO, window 0x0, keys: 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 FocusOut event, serial 31, synthetic NO, window 0x3e00001, mode NotifyUngrab, detail NotifyPointer FocusIn event, serial 31, synthetic NO, window 0x3e00001, mode NotifyGrab, detail NotifyPointer KeymapNotify event, serial 31, synthetic NO, window 0x0, keys: 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 FocusOut event, serial 31, synthetic NO, window 0x3e00001, mode NotifyUngrab, detail NotifyPointer FocusIn event, serial 31, synthetic NO, window 0x3e00001, mode NotifyGrab, detail NotifyPointer KeymapNotify event, serial 31, synthetic NO, window 0x0, keys: 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 FocusOut event, serial 31, synthetic NO, window 0x3e00001, mode NotifyUngrab, detail NotifyPointer FocusIn event, serial 31, synthetic NO, window 0x3e00001, mode NotifyGrab, detail NotifyPointer KeymapNotify event, serial 31, synthetic NO, window 0x0, keys: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 FocusOut event, serial 31, synthetic NO, window 0x3e00001, mode NotifyUngrab, detail NotifyPointer FocusIn event, serial 31, synthetic NO, window 0x3e00001, mode NotifyGrab, detail NotifyPointer KeymapNotify event, serial 31, synthetic NO, window 0x0, keys: 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 FocusOut event, serial 31, synthetic NO, window 0x3e00001, mode NotifyUngrab, detail NotifyPointer FocusIn event, serial 31, synthetic NO, window 0x3e00001, mode NotifyGrab, detail NotifyPointer KeymapNotify event, serial 31, synthetic NO, window 0x0, keys: 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 FocusOut event, serial 31, synthetic NO, window 0x3e00001, mode NotifyUngrab, detail NotifyPointer FocusIn event, serial 31, synthetic NO, window 0x3e00001, mode NotifyGrab, detail NotifyPointer KeymapNotify event, serial 31, synthetic NO, window 0x0, keys: 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 FocusOut event, serial 31, synthetic NO, window 0x3e00001, mode NotifyUngrab, detail NotifyPointer FocusIn event, serial 31, synthetic NO, window 0x3e00001, mode NotifyGrab, detail NotifyPointer KeymapNotify event, serial 31, synthetic NO, window 0x0, keys: 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 FocusOut event, serial 31, synthetic NO, window 0x3e00001, mode NotifyUngrab, detail NotifyPointer FocusIn event, serial 31, synthetic NO, window 0x3e00001, mode NotifyGrab, detail NotifyPointer KeymapNotify event, serial 31, synthetic NO, window 0x0, keys: 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 FocusOut event, serial 31, synthetic NO, window 0x3e00001, mode NotifyUngrab, detail NotifyPointer