From: Bilal Elmoussaoui <bil.elmoussaoui@gmail.com>
Date: Sat, 1 Jan 2022 16:39:45 +0000 (+0100)
Subject: gtk: add nullable annotations for Scrollable getters
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gtk: add nullable annotations for Scrollable getters

The adjustment setters takes a nullable and so should the getters be annotated
---

diff --git a/gtk/gtkscrollable.c b/gtk/gtkscrollable.c
index 0d4a2d51af..041f09ac04 100644
--- a/gtk/gtkscrollable.c
+++ b/gtk/gtkscrollable.c
@@ -130,7 +130,7 @@ gtk_scrollable_default_init (GtkScrollableInterface *iface)
  *
  * Retrieves the `GtkAdjustment` used for horizontal scrolling.
  *
- * Returns: (transfer none): horizontal `GtkAdjustment`.
+ * Returns: (transfer none) (nullable): horizontal `GtkAdjustment`.
  */
 GtkAdjustment *
 gtk_scrollable_get_hadjustment (GtkScrollable *scrollable)
@@ -174,7 +174,7 @@ gtk_scrollable_set_hadjustment (GtkScrollable *scrollable,
  *
  * Retrieves the `GtkAdjustment` used for vertical scrolling.
  *
- * Returns: (transfer none): vertical `GtkAdjustment`.
+ * Returns: (transfer none) (nullable): vertical `GtkAdjustment`.
  */
 GtkAdjustment *
 gtk_scrollable_get_vadjustment (GtkScrollable *scrollable)