add option for set button map

config.def.h

@@ -85,6 +85,11 @@ LIBINPUT_CONFIG_ACCEL_PROFILE_ADAPTIVE
 */
 static const enum libinput_config_accel_profile accel_profile = LIBINPUT_CONFIG_ACCEL_PROFILE_ADAPTIVE;
 static const double accel_speed = 0.0;
+/* You can choose between:
+LIBINPUT_CONFIG_TAP_MAP_LRM -- 1/2/3 finger tap maps to left/right/middle
+LIBINPUT_CONFIG_TAP_MAP_LMR -- 1/2/3 finger tap maps to left/middle/right
+*/
+static const enum libinput_config_tap_button_map button_map = LIBINPUT_CONFIG_TAP_MAP_LRM;
 
 /* If you want to use the windows key for MODKEY, use WLR_MODIFIER_LOGO */
 #define MODKEY WLR_MODIFIER_ALT

dwl.c

@@ -951,6 +951,7 @@ createpointer(struct wlr_pointer *pointer)
 			libinput_device_config_tap_set_enabled(libinput_device, tap_to_click);
 			libinput_device_config_tap_set_drag_enabled(libinput_device, tap_and_drag);
 			libinput_device_config_tap_set_drag_lock_enabled(libinput_device, drag_lock);
+			libinput_device_config_tap_set_button_map(libinput_device, button_map);
 		}
 
 		if (libinput_device_config_scroll_has_natural_scroll(libinput_device))