[gtk: 1/2] Annotate sequence argument of GtkGesture signals as nullable

[Carlos Garnacho <carlosg src gnome org>]

commit ae5d1cd1612c6e5129ccb01ea79cc8aaabd30b5e
Author: Sebastian Dröge <sebastian centricular com>
Date:   Wed Sep 2 13:32:20 2020 +0300

    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 7f983d8586..66546efa6f 100644
--- a/gtk/gtkgesture.c
+++ b/gtk/gtkgesture.c
@@ -763,7 +763,7 @@ 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.
@@ -782,7 +782,7 @@ 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, or the number of touch sequences became
@@ -803,7 +803,7 @@ 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.
@@ -818,7 +818,7 @@ 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
@@ -837,7 +837,7 @@ 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