[gtk] spinbutton: Use increment/decrement icon names

[Timm Bäder <baedert src gnome org>]

commit 5fd936beef7a999828e5e3625506ea6708188762
Author: Timm Bäder <mail baedert org>
Date:   Fri Jan 11 18:17:08 2019 +0100

    spinbutton: Use increment/decrement icon names
    
    And add list-{remove,add}-symbolic as fallback.
    
    Fixes #1569

 gtk/gtkspinbutton.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkspinbutton.c b/gtk/gtkspinbutton.c
index 5bf431ee8e..37fb282cf7 100644
--- a/gtk/gtkspinbutton.c
+++ b/gtk/gtkspinbutton.c
@@ -840,6 +840,9 @@ static void
 gtk_spin_button_init (GtkSpinButton *spin_button)
 {
   GtkSpinButtonPrivate *priv = gtk_spin_button_get_instance_private (spin_button);
+  const char *up_icon_names[] = { "value-increase-symbolic", "list-add-symbolic" };
+  const char *down_icon_names[] = { "value-decrease-symbolic", "list-remove-symbolic" };
+  GIcon *icon;
   GtkEventController *controller;
   GtkGesture *gesture;
 
@@ -873,7 +876,12 @@ gtk_spin_button_init (GtkSpinButton *spin_button)
   g_signal_connect (priv->entry, "activate", G_CALLBACK (gtk_spin_button_activate), spin_button);
   gtk_container_add (GTK_CONTAINER (priv->box), priv->entry);
 
-  priv->down_button = gtk_button_new_from_icon_name ("list-remove-symbolic");
+
+  priv->down_button = gtk_button_new ();
+  icon = g_themed_icon_new_from_names ((char **)down_icon_names, 2);
+  gtk_container_add (GTK_CONTAINER (priv->down_button), gtk_image_new_from_gicon (icon));
+  g_object_unref (icon);
+  gtk_style_context_add_class (gtk_widget_get_style_context (priv->down_button), "image-button");
   gtk_widget_set_can_focus (priv->down_button, FALSE);
   gtk_style_context_add_class (gtk_widget_get_style_context (priv->down_button), "down");
   gtk_container_add (GTK_CONTAINER (priv->box), priv->down_button);
@@ -887,7 +895,11 @@ gtk_spin_button_init (GtkSpinButton *spin_button)
   g_signal_connect (gesture, "released", G_CALLBACK (button_released_cb), spin_button);
   gtk_widget_add_controller (GTK_WIDGET (priv->down_button), GTK_EVENT_CONTROLLER (gesture));
 
-  priv->up_button = gtk_button_new_from_icon_name ("list-add-symbolic");
+  priv->up_button = gtk_button_new ();
+  icon = g_themed_icon_new_from_names ((char **)up_icon_names, 2);
+  gtk_container_add (GTK_CONTAINER (priv->up_button), gtk_image_new_from_gicon (icon));
+  g_object_unref (icon);
+  gtk_style_context_add_class (gtk_widget_get_style_context (priv->up_button), "image-button");
   gtk_widget_set_can_focus (priv->up_button, FALSE);
   gtk_style_context_add_class (gtk_widget_get_style_context (priv->up_button), "up");
   gtk_container_add (GTK_CONTAINER (priv->box), priv->up_button);