Dear Maintainer, Here the output of "xev" command:
--- BEGIN --- $xev Outer window is 0x5400001, inner window is 0x5400002 PropertyNotify event, serial 8, synthetic NO, window 0x5400001, atom 0x27 (WM_NAME), time 5586921, state PropertyNewValue PropertyNotify event, serial 9, synthetic NO, window 0x5400001, atom 0x22 (WM_COMMAND), time 5586921, state PropertyNewValue PropertyNotify event, serial 10, synthetic NO, window 0x5400001, atom 0x28 (WM_NORMAL_HINTS), time 5586921, state PropertyNewValue CreateNotify event, serial 11, synthetic NO, window 0x5400001, parent 0x5400001, window 0x5400002, (10,10), width 50, height 50 border_width 4, override NO PropertyNotify event, serial 12, synthetic NO, window 0x5400001, atom 0x1d7 (_KDE_NET_WM_USER_CREATION_TIME), time 5586921, state PropertyNewValue PropertyNotify event, serial 14, synthetic NO, window 0x5400001, atom 0x12b (WM_PROTOCOLS), time 5586921, state PropertyNewValue MapNotify event, serial 15, synthetic NO, window 0x5400001, event 0x5400001, window 0x5400002, override NO ConfigureNotify event, serial 20, synthetic NO, window 0x5400001, event 0x5400001, window 0x5400001, (0,0), width 178, height 178, border_width 0, above 0x1e00024, override NO ReparentNotify event, serial 20, synthetic NO, window 0x5400001, event 0x5400001, window 0x5400001, parent 0x1e095b9, (0,0), override NO PropertyNotify event, serial 20, synthetic NO, window 0x5400001, atom 0x154 (_NET_WM_STATE), time 5586922, state PropertyNewValue MapNotify event, serial 20, synthetic NO, window 0x5400001, event 0x5400001, window 0x5400001, override NO VisibilityNotify event, serial 20, synthetic NO, window 0x5400001, state VisibilityPartiallyObscured Expose event, serial 20, synthetic NO, window 0x5400001, (0,0), width 1, height 1, count 0 PropertyNotify event, serial 20, synthetic NO, window 0x5400001, atom 0x132 (WM_STATE), time 5586922, state PropertyNewValue PropertyNotify event, serial 20, synthetic NO, window 0x5400001, atom 0x1ba (_NET_FRAME_EXTENTS), time 5586924, state PropertyNewValue PropertyNotify event, serial 20, synthetic NO, window 0x5400001, atom 0x170 (_KDE_NET_WM_FRAME_STRUT), time 5586924, state PropertyNewValue PropertyNotify event, serial 20, synthetic NO, window 0x5400001, atom 0x1cf (_KDE_NET_WM_ACTIVITIES), time 5586924, state PropertyNewValue PropertyNotify event, serial 20, synthetic NO, window 0x5400001, atom 0x154 (_NET_WM_STATE), time 5586924, state PropertyNewValue PropertyNotify event, serial 20, synthetic NO, window 0x5400001, atom 0x1b2 (_NET_WM_DESKTOP), time 5586924, state PropertyNewValue PropertyNotify event, serial 20, synthetic NO, window 0x5400001, atom 0x1dc (_KDE_NET_WM_TAB_GROUP), time 5586924, state PropertyNewValue PropertyNotify event, serial 20, synthetic NO, window 0x5400001, atom 0x1dc (_KDE_NET_WM_TAB_GROUP), time 5586924, state PropertyNewValue PropertyNotify event, serial 20, synthetic NO, window 0x5400001, atom 0x1b8 (_NET_WM_ALLOWED_ACTIONS), time 5586924, state PropertyNewValue PropertyNotify event, serial 20, synthetic NO, window 0x5400001, atom 0x154 (_NET_WM_STATE), time 5586925, state PropertyNewValue FocusIn event, serial 20, synthetic NO, window 0x5400001, mode NotifyNormal, detail NotifyNonlinear KeymapNotify event, serial 20, synthetic NO, window 0x0, keys: 0 0 0 0 16 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 VisibilityNotify event, serial 20, synthetic NO, window 0x5400001, state VisibilityUnobscured Expose event, serial 20, synthetic NO, window 0x5400001, (1,0), width 177, height 1, count 4 Expose event, serial 20, synthetic NO, window 0x5400001, (0,1), width 178, height 9, count 3 Expose event, serial 20, synthetic NO, window 0x5400001, (0,10), width 10, height 58, count 2 Expose event, serial 20, synthetic NO, window 0x5400001, (68,10), width 110, height 58, count 1 Expose event, serial 20, synthetic NO, window 0x5400001, (0,68), width 178, height 110, count 0 ConfigureNotify event, serial 20, synthetic YES, window 0x5400001, event 0x5400001, window 0x5400001, (2,23), width 178, height 178, border_width 0, above 0x0, override NO KeyRelease event, serial 37, synthetic NO, window 0x5400001, root 0xaf, subw 0x0, time 5586962, (607,535), root:(609,558), state 0x0, keycode 36 (keysym 0xff0d, Return), same_screen YES, " XLookupString gives 1 bytes: (0d) " XFilterEvent returns: False PropertyNotify event, serial 40, synthetic NO, window 0x5400001, atom 0x1b5 (_NET_WM_ICON_GEOMETRY), time 5587446, state PropertyNewValue KeyPress event, serial 41, synthetic NO, window 0x5400001, root 0xaf, subw 0x0, time 5589758, (607,535), root:(609,558), state 0x0, keycode 199 (keysym 0x1008ffa9, XF86TouchpadToggle), same_screen YES, XLookupString gives 0 bytes: XmbLookupString gives 0 bytes: XFilterEvent returns: False KeyRelease event, serial 41, synthetic NO, window 0x5400001, root 0xaf, subw 0x0, time 5589764, (607,535), root:(609,558), state 0x0, keycode 199 (keysym 0x1008ffa9, XF86TouchpadToggle), same_screen YES, XLookupString gives 0 bytes: XFilterEvent returns: False ClientMessage event, serial 41, synthetic YES, window 0x5400001, message_type 0x12b (WM_PROTOCOLS), format 32, message 0x12c (WM_DELETE_WINDOW) --- END ---