[PATCH xf86-input-libinput] Post a motion event before a tablet button down

[Peter Hutterer]

Not all clients update the pointer position correctly from the button events
(for historical reasons) so we need to send a motion event before the button
event that represents a tip state change.

https://bugs.freedesktop.org/show_bug.cgi?id=101588

Signed-off-by: Peter Hutterer <peter.hutterer at who-t.net>
---
 src/xf86libinput.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/xf86libinput.c b/src/xf86libinput.c
index 2f6d62d..357715e 100644
--- a/src/xf86libinput.c
+++ b/src/xf86libinput.c
@@ -214,6 +214,10 @@ update_mode_prop(InputInfoPtr pInfo,
 static enum event_handling
 xf86libinput_handle_event(struct libinput_event *event);
 
+static void
+xf86libinput_post_tablet_motion(InputInfoPtr pInfo,
+				struct libinput_event_tablet_tool *event);
+
 static inline int
 use_server_fd(const InputInfoPtr pInfo) {
 	return pInfo->fd > -1 && (pInfo->flags & XI86_SERVER_FD);
@@ -1723,12 +1727,15 @@ static enum event_handling
 xf86libinput_handle_tablet_tip(InputInfoPtr pInfo,
 			       struct libinput_event_tablet_tool *event)
 {
+	DeviceIntPtr pDev = pInfo->dev;
 	enum libinput_tablet_tool_tip_state state;
 	const BOOL is_absolute = TRUE;
 
 	if (xf86libinput_tool_queue_event(event))
 		return EVENT_QUEUED;
 
+	xf86libinput_post_tablet_motion(pDev->public.devicePrivate, event);
+
 	state = libinput_event_tablet_tool_get_tip_state(event);
 
 	xf86PostButtonEventP(pInfo->dev,
-- 
2.13.0