[libhandy] swipe-tracker: Don't switch to capture phase when not necessary

[Alexander Mikhaylenko <alexm src gnome org>]

commit 2afa46f6e7a5064adbf2e5a72c448eb0a6804838
Author: Alexander Mikhaylenko <exalm7659 gmail com>
Date:   Sun Nov 1 13:45:46 2020 +0500

    swipe-tracker: Don't switch to capture phase when not necessary
    
    Only switch to the capture phase when the sequence is going to be actually
    handled.
    
    Fixes https://gitlab.gnome.org/GNOME/libhandy/-/issues/359

 src/hdy-swipe-tracker.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/src/hdy-swipe-tracker.c b/src/hdy-swipe-tracker.c
index 816b81ae..86e7fd7f 100644
--- a/src/hdy-swipe-tracker.c
+++ b/src/hdy-swipe-tracker.c
@@ -666,9 +666,11 @@ captured_event_cb (HdySwipeable *swipeable,
   if (!self->use_capture_phase && !should_force_drag (self, widget))
     return GDK_EVENT_PROPAGATE;
 
-  self->use_capture_phase = TRUE;
-
   sequence = gdk_event_get_event_sequence (event);
+
+  if (gtk_gesture_handles_sequence (self->touch_gesture, sequence))
+    self->use_capture_phase = TRUE;
+
   retval = gtk_event_controller_handle_event (GTK_EVENT_CONTROLLER (self->touch_gesture), event);
   state = gtk_gesture_get_sequence_state (self->touch_gesture, sequence);