[gtk/fix-entry-completion: 3/4] Add gtk_widget_prepend_controller

[Matthias Clasen <matthiasc src gnome org>]

commit 692cc42e1023ec439d2fa1a0b9456e8cbfe1cec8
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Jun 22 12:47:27 2020 -0400

    Add gtk_widget_prepend_controller
    
    Add a variant of gtk_widget_add_controller that
    inserts the controller at the beginning, instead
    of the end. This will be used in entry completion
    to make sure the entry completion key event handling
    supersedes the entry one while the popup is open.
    
    Keep this private for now, until we determine if
    it needs to be public api.

 gtk/gtkwidget.c        | 17 +++++++++++++++++
 gtk/gtkwidgetprivate.h |  3 +++
 2 files changed, 20 insertions(+)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 2cedb2508f..61ae38f0b5 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -11415,6 +11415,23 @@ gtk_widget_add_controller (GtkWidget          *widget,
     gtk_list_list_model_item_added_at (priv->controller_observer, priv->controllers->len - 1);
 }
 
+void
+gtk_widget_prepend_controller (GtkWidget          *widget,
+                               GtkEventController *controller)
+{
+  GtkWidgetPrivate *priv = gtk_widget_get_instance_private (widget);
+
+  GTK_EVENT_CONTROLLER_GET_CLASS (controller)->set_widget (controller, widget);
+
+  if (G_UNLIKELY (!priv->controllers))
+    priv->controllers = g_ptr_array_new ();
+
+  g_ptr_array_insert (priv->controllers, 0, controller);
+
+  if (priv->controller_observer)
+    gtk_list_list_model_item_added_at (priv->controller_observer, 0);
+}
+
 /**
  * gtk_widget_remove_controller:
  * @widget: a #GtkWidget
diff --git a/gtk/gtkwidgetprivate.h b/gtk/gtkwidgetprivate.h
index e7688a65cd..d281dd0f43 100644
--- a/gtk/gtkwidgetprivate.h
+++ b/gtk/gtkwidgetprivate.h
@@ -346,6 +346,9 @@ gboolean          gtk_widget_run_controllers               (GtkWidget
                                                             double               x,
                                                             double               y,
                                                             GtkPropagationPhase  phase);
+
+void              gtk_widget_prepend_controller            (GtkWidget             *widget,
+                                                            GtkEventController    *controller);
 void              gtk_widget_handle_crossing               (GtkWidget             *widget,
                                                             const GtkCrossingData *crossing,
                                                             double                 x,