input: send touch frame event after up event

Currently the frame event gets lost: The touch focus is removed in the 'up'
event. So the focus is gone when the frame event arrives so it is never sent to
the clients.

To avoid this, keep the touch focus until the frame is handled.

Signed-off-by: Michael Olbrich <m.olbrich@pengutronix.de>
(cherry picked from commit 5448580111b5ff992ce2603cb6e99b9f54db7ad8)

This has undergone a change to avoid an ABI break, so rather than
hooking up a pending_touch boolean in weston_touch, keep a local list of
weston_touch_devices and have a pending_touch with each device to check
upon.

Signed-off-by: Marius Vlad <marius.vlad@collabora.com>

libweston/input.c

@@ -75,6 +75,15 @@ struct border {
 	enum motion_direction blocking_dir;
 };
 
+struct pending_touch {
+	struct weston_touch_device *touch_device;
+	bool pending_focus_touch_reset;
+
+	struct wl_list touch_link;
+};
+
+static struct wl_list pending_touch_list;
+
 static void
 maybe_warp_confined_pointer(struct weston_pointer_constraint *constraint);
 
@@ -143,6 +152,7 @@ weston_touch_create_touch_device(struct weston_touch *touch,
 				 const struct weston_touch_device_ops *ops)
 {
 	struct weston_touch_device *device;
+	struct pending_touch *pt;
 
 	assert(syspath);
 	if (ops) {
@@ -164,20 +174,55 @@ weston_touch_create_touch_device(struct weston_touch *touch,
 		return NULL;
 	}
 
+	pt = zalloc(sizeof(*pt));
+	if (!pt) {
+		free(device);
+		return NULL;
+	}
+
+
 	device->backend_data = backend_data;
 	device->ops = ops;
 
+	pt->touch_device = device;
+	pt->pending_focus_touch_reset = false;
+
 	device->aggregate = touch;
 	wl_list_insert(touch->device_list.prev, &device->link);
+	wl_list_insert(&pending_touch_list, &pt->touch_link);
 
 	return device;
 }
 
+static struct pending_touch *
+weston_touch_get_pending(struct weston_touch_device *dev)
+{
+	struct pending_touch *pt_iter = NULL;
+	struct pending_touch *pt = NULL;
+
+	wl_list_for_each(pt_iter, &pending_touch_list, touch_link) {
+		if (pt_iter->touch_device == dev) {
+			pt = pt_iter;
+			break;
+		}
+	}
+
+	return pt;
+}
+
 /** Destroy the touch device. */
 WL_EXPORT void
 weston_touch_device_destroy(struct weston_touch_device *device)
 {
+	struct pending_touch *pt = NULL;
+
 	wl_list_remove(&device->link);
+	pt = weston_touch_get_pending(device);
+
+	assert(pt);
+	wl_list_remove(&pt->touch_link);
+	free(pt);
+
 	wl_signal_emit(&device->destroy_signal, device);
 	free(device->syspath);
 	free(device);
@@ -2388,6 +2433,7 @@ process_touch_normal(struct weston_touch_device *device,
 	struct weston_touch_grab *grab = device->aggregate->grab;
 	struct weston_compositor *ec = device->aggregate->seat->compositor;
 	struct weston_view *ev;
+	struct pending_touch *pt = NULL;
 	wl_fixed_t sx, sy;
 	wl_fixed_t x = wl_fixed_from_double(double_x);
 	wl_fixed_t y = wl_fixed_from_double(double_y);
@@ -2438,8 +2484,9 @@ process_touch_normal(struct weston_touch_device *device,
 		break;
 	case WL_TOUCH_UP:
 		grab->interface->up(grab, time, touch_id);
-		if (touch->num_tp == 0)
-			weston_touch_set_focus(touch, NULL);
+		pt = weston_touch_get_pending(device);
+		assert(pt);
+		pt->pending_focus_touch_reset = true;
 		break;
 	}
 }
@@ -2628,12 +2675,22 @@ WL_EXPORT void
 notify_touch_frame(struct weston_touch_device *device)
 {
 	struct weston_touch_grab *grab;
+	struct pending_touch *pt;
 
 	switch (weston_touch_device_get_mode(device)) {
 	case WESTON_TOUCH_MODE_NORMAL:
 	case WESTON_TOUCH_MODE_PREP_CALIB:
 		grab = device->aggregate->grab;
 		grab->interface->frame(grab);
+
+		pt = weston_touch_get_pending(device);
+		assert(pt);
+
+		if (pt->pending_focus_touch_reset) {
+			if (grab->touch->num_tp == 0)
+				weston_touch_set_focus(grab->touch, NULL);
+			pt->pending_focus_touch_reset = false;
+		}
 		break;
 	case WESTON_TOUCH_MODE_CALIB:
 	case WESTON_TOUCH_MODE_PREP_NORMAL:
@@ -5059,6 +5116,8 @@ bind_input_timestamps_manager(struct wl_client *client, void *data,
 int
 weston_input_init(struct weston_compositor *compositor)
 {
+	wl_list_init(&pending_touch_list);
+
 	if (!wl_global_create(compositor->wl_display,
 			      &zwp_relative_pointer_manager_v1_interface, 1,
 			      compositor, bind_relative_pointer_manager))