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Po Lu authored
* configure.ac: Add an option to use XInput 2 if available. * src/Makefile.in (XINPUT_LIBS, XINPUT_CFLAGS): New variables. (EMACS_CFLAGS): Add Xinput CFLAGS. (LIBES): Add XInput libs. * src/xmenu.c (popup_activated_flag): Expose flag if XInput 2 is available. * src/xfns.c (x_window): Set XInput 2 event mask. (setup_xi_event_mask): New function. (syms_of_xfns): Provide XInput 2 feature. * src/xterm.c (x_detect_focus_change): Handle XInput 2 GenericEvents. (handle_one_xevent): Handle XInput 2 events. (x_term_init): Ask the server for XInput 2 support and set xkb_desc if available. (x_delete_terminal): Free XKB kb desc if it exists, and free XI2 devices if they exist. (xi_grab_or_ungrab_device) (xi_reset_scroll_valuators_for_device_id) (x_free_xi_devices, x_init_master_valuators): New functions. (x_get_scroll_valuator_delta): New function. (init_xterm): Don't tell GTK to only use Core Input when built with XInput 2 support. * src/xterm.h (struct x_display_info): Add fields for XKB and XI2 support. * src/gtkutil.c (xg_event_is_for_menubar): Handle XIDeviceEvents. (xg_is_menu_window): New function. (xg_event_is_for_scrollbar): Handle XIDeviceEvents. * etc/NEWS: Document changes. * lisp/mwheel.el (mouse-wheel-down-alternate-event) (mouse-wheel-up-alternate-event) (mouse-wheel-left-alternate-event) (mouse-wheel-right-alternate-event): New user options. (mouse-wheel-text-scale) (mwheel-scroll): Test for alternate events. (mouse-wheel--setup-bindings): Set up bindings for alternate buttons.
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