[gtk/cherry-pick-21b9dad9] Merge branch 'gesture-nullable-sequence' into 'master'

[Sebastian Dröge <sdroege src gnome org>]

commit a95f5cf7988f01b9bbe93b28e05aaaf4ba1c89ea
Author: Carlos Garnacho <carlosg gnome org>
Date:   Wed Sep 2 11:11:54 2020 +0000

    Merge branch 'gesture-nullable-sequence' into 'master'
    
    Annotate sequence argument of GtkGesture signals as nullable
    
    See merge request GNOME/gtk!2520
    
    (cherry picked from commit 21b9dad9e6a4852d8756a7e98efafb683501ddbd)
    
    ae5d1cd1 Annotate sequence argument of GtkGesture signals as nullable

 gtk/gtkgesture.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)
---
diff --git a/gtk/gtkgesture.c b/gtk/gtkgesture.c
index 4bb7715f38..98e07c7b6e 100644
--- a/gtk/gtkgesture.c
+++ b/gtk/gtkgesture.c
@@ -891,7 +891,7 @@ gtk_gesture_class_init (GtkGestureClass *klass)
   /**
    * GtkGesture::begin:
    * @gesture: the object which received the signal
-   * @sequence: the #GdkEventSequence that made the gesture to be recognized
+   * @sequence: (nullable): the #GdkEventSequence that made the gesture to be recognized
    *
    * This signal is emitted when the gesture is recognized. This means the
    * number of touch sequences matches #GtkGesture:n-points, and the #GtkGesture::check
@@ -913,7 +913,7 @@ gtk_gesture_class_init (GtkGestureClass *klass)
   /**
    * GtkGesture::end:
    * @gesture: the object which received the signal
-   * @sequence: the #GdkEventSequence that made gesture recognition to finish
+   * @sequence: (nullable): the #GdkEventSequence that made gesture recognition to finish
    *
    * This signal is emitted when @gesture either stopped recognizing the event
    * sequences as something to be handled (the #GtkGesture::check handler returned
@@ -937,7 +937,7 @@ gtk_gesture_class_init (GtkGestureClass *klass)
   /**
    * GtkGesture::update:
    * @gesture: the object which received the signal
-   * @sequence: the #GdkEventSequence that was updated
+   * @sequence: (nullable): the #GdkEventSequence that was updated
    *
    * This signal is emitted whenever an event is handled while the gesture is
    * recognized. @sequence is guaranteed to pertain to the set of active touches.
@@ -954,7 +954,7 @@ gtk_gesture_class_init (GtkGestureClass *klass)
   /**
    * GtkGesture::cancel:
    * @gesture: the object which received the signal
-   * @sequence: the #GdkEventSequence that was cancelled
+   * @sequence: (nullable): the #GdkEventSequence that was cancelled
    *
    * This signal is emitted whenever a sequence is cancelled. This usually
    * happens on active touches when gtk_event_controller_reset() is called
@@ -975,7 +975,7 @@ gtk_gesture_class_init (GtkGestureClass *klass)
   /**
    * GtkGesture::sequence-state-changed:
    * @gesture: the object which received the signal
-   * @sequence: the #GdkEventSequence that was cancelled
+   * @sequence: (nullable): the #GdkEventSequence that was cancelled
    * @state: the new sequence state
    *
    * This signal is emitted whenever a sequence state changes. See