[gnome-shell/gbsneto/rescan-icon-cache-properly: 1/2] st/texture-cache: Monitor GtkIconTheme changes

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 49f6097b9e56bae756bccaa9d0c722bdb48767be
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Thu Aug 1 20:54:42 2019 -0300

    st/texture-cache: Monitor GtkIconTheme changes
    
    The texture cache, right now, only monitors for
    complete theme changes. If the contents of the
    icon theme change, however, the texture cache
    isn't properly invalidated.
    
    This manifests itself as a randomly reproducible
    bug when installing an app; the app icon may be
    the fallback forever, or as long as something else
    updates the icon theme.
    
    Watch for the GtkIconTheme:changed signal, and
    evict the texture cache when the theme changes.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/661

 src/st/st-texture-cache.c | 10 ++++++++++
 1 file changed, 10 insertions(+)
---
diff --git a/src/st/st-texture-cache.c b/src/st/st-texture-cache.c
index eec28007b..bf54c6514 100644
--- a/src/st/st-texture-cache.c
+++ b/src/st/st-texture-cache.c
@@ -150,6 +150,14 @@ on_icon_theme_changed (StSettings     *settings,
   g_signal_emit (cache, signals[ICON_THEME_CHANGED], 0);
 }
 
+static void
+on_gtk_icon_theme_changed (GtkIconTheme   *icon_theme,
+                           StTextureCache *self)
+{
+  st_texture_cache_evict_icons (self);
+  g_signal_emit (self, signals[ICON_THEME_CHANGED], 0);
+}
+
 static void
 st_texture_cache_init (StTextureCache *self)
 {
@@ -160,6 +168,8 @@ st_texture_cache_init (StTextureCache *self)
   self->priv->icon_theme = gtk_icon_theme_new ();
   gtk_icon_theme_add_resource_path (self->priv->icon_theme,
                                     "/org/gnome/shell/theme/icons");
+  g_signal_connect (self->priv->icon_theme, "changed",
+                    G_CALLBACK (on_gtk_icon_theme_changed), self);
 
   settings = st_settings_get ();
   g_signal_connect (settings, "notify::gtk-icon-theme",