Add middle mouse button emulation config options

Adds the following quartett of functions to enable/disable middle mouse button
emulation on a device:
	libinput_device_config_middle_emulation_is_available()
	libinput_device_config_middle_emulation_set_enabled()
	libinput_device_config_middle_emulation_get_enabled()
	libinput_device_config_middle_emulation_get_default_enabled()

This patch only adds the config framework, it is not hooked up to anything
yet.

Note: like other features this is merely the config option, some devices will
provide middle button emulation without exposing it as configuration. i.e. the
return value of libinput_device_config_middle_emulation_is_available() only
tells you whether you can _configure_ middle button emulation.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/tools/shared.h b/tools/shared.h
index caf48558..01edffc9 100644
--- a/tools/shared.h
+++ b/tools/shared.h
@@ -39,6 +39,7 @@ struct tools_options {
 	int tapping;
 	int natural_scroll;
 	int left_handed;
+	int middlebutton;
 	enum libinput_config_click_method click_method;
 	double speed;
 };