[libadwaita/wip/exalm/hicolor] main: Use hicolor icons

[Alexander Mikhaylenko <alexm src gnome org>]

commit 85d708269158c5724dac79ce7a770f772cb8d4f6
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Tue May 4 22:57:42 2021 +0500

    main: Use hicolor icons
    
    Don't depend on adwaita-icon-theme, apps should bundle their icons instead.
    
    Fixes https://gitlab.gnome.org/GNOME/libadwaita/-/issues/113

 src/adw-main.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)
---
diff --git a/src/adw-main.c b/src/adw-main.c
index 45a3c0d..829a8da 100644
--- a/src/adw-main.c
+++ b/src/adw-main.c
@@ -64,12 +64,23 @@ update_theme (void)
   g_object_set (settings, "gtk-theme-name", new_theme_name, NULL);
 }
 
+static inline void
+update_icons (void)
+{
+  g_object_set (gtk_settings_get_default (),
+                "gtk-icon-theme-name", "hicolor",
+                NULL);
+}
+
 static void
 setting_changed_cb (GdkDisplay *display,
                     const char *setting)
 {
   if (!g_strcmp0 (setting, "gtk-theme-name"))
     update_theme ();
+
+  if (!g_strcmp0 (setting, "gtk-icon-theme-name"))
+    update_icons ();
 }
 
 static void
@@ -102,6 +113,7 @@ adw_style_init (void)
                     NULL);
 
   update_theme ();
+  update_icons ();
 
   g_once_init_leave (&guard, 1);
 }