Simplify icon handling a bit.

When implementing bug 765359, it appears that Geary is doing too much
work to load icons. Simplify it a bit.

* src/client/components/icon-factory.vala (IconFactory): Don't bother
  loading an application icon, it's easier and works better to just use
  an icon name where needed. Don't bother adding all of the icons/*x*
  directories to the icon theme search path, just make the icon's
  directory hierarchy follow the XDG/hicolor spec and add the base
  directory. Remove now-redundant code.

* src/client/application/geary-controller.vala: Set the default icon name
  for all geary windows.
  (GearyController:on_about()): Set the name for the icon in the About
  dialog.

* src/client/components/main-window.vala (ApplicationWindow): Don't
  bother loading icons for the window, just use the new default.

* src/client/notification/libnotify.vala: Don't bother passing the
  application icon through for error notifications, an icon name has
  already been set.

* icons/*x*/geary.png: Move to a new directory hierarchy that follows the
  hicolor spec.

* icons/CMakeLists.txt: Updated to use new paths to the icons.

icons/CMakeLists.txt

@@ -27,13 +27,13 @@ set(ICON_FILES
 install(FILES ${ICON_FILES} DESTINATION ${ICONS_DEST})
 
 # Application icon goes in theme directory
-install(FILES "16x16/geary.png" DESTINATION share/icons/hicolor/16x16/apps)
-install(FILES "24x24/geary.png" DESTINATION share/icons/hicolor/24x24/apps)
-install(FILES "32x32/geary.png" DESTINATION share/icons/hicolor/32x32/apps)
-install(FILES "48x48/geary.png" DESTINATION share/icons/hicolor/48x48/apps)
-install(FILES "256x256/geary.png" DESTINATION share/icons/hicolor/256x256/apps)
-install(FILES "512x512/geary.png" DESTINATION share/icons/hicolor/512x512/apps)
-install(FILES "geary-symbolic.svg" DESTINATION share/icons/hicolor/symbolic/apps)
+install(FILES "hicolor/16x16/apps/geary.png" DESTINATION share/icons/hicolor/16x16/apps)
+install(FILES "hicolor/24x24/apps/geary.png" DESTINATION share/icons/hicolor/24x24/apps)
+install(FILES "hicolor/32x32/apps/geary.png" DESTINATION share/icons/hicolor/32x32/apps)
+install(FILES "hicolor/48x48/apps/geary.png" DESTINATION share/icons/hicolor/48x48/apps)
+install(FILES "hicolor/256x256/apps/geary.png" DESTINATION share/icons/hicolor/256x256/apps)
+install(FILES "hicolor/512x512/apps/geary.png" DESTINATION share/icons/hicolor/512x512/apps)
+install(FILES "hicolor/symbolic/apps/geary-symbolic.svg" DESTINATION share/icons/hicolor/symbolic/apps)
 
 # Optional: update icon cache at install time.
 if (ICON_UPDATE)

src/client/application/geary-controller.vala

@@ -174,10 +174,14 @@ public class GearyController : Geary.BaseObject {
      * Starts the controller and brings up Geary.
      */
     public async void open_async() {
-        // This initializes the IconFactory, important to do before the actions are created (as they
-        // refer to some of Geary's custom icons)
+        // This initializes the IconFactory, important to do before
+        // the actions are created (as they refer to some of Geary's
+        // custom icons)
         IconFactory.instance.init();
 
+        // Ensure all geary windows have an icon
+        Gtk.Window.set_default_icon_name("geary");
+
         // Setup actions.
         setup_actions();
         GearyApplication.instance.load_ui_resource("accelerators.ui");
@@ -1709,6 +1713,7 @@ public class GearyController : Geary.BaseObject {
             "authors", GearyApplication.AUTHORS,
             "copyright", GearyApplication.COPYRIGHT,
             "license-type", Gtk.License.LGPL_2_1,
+            "logo-icon-name", "geary",
             "version", GearyApplication.VERSION,
             "website", GearyApplication.WEBSITE,
             "website-label", GearyApplication.WEBSITE_LABEL,

src/client/components/icon-factory.vala

@@ -21,9 +21,6 @@ public class IconFactory {
         private set { _instance = value; }
     }
 
-    public const int APPLICATION_ICON_SIZE = 128;
-    public Gdk.Pixbuf application_icon { get; private set; }
-    
     public const int UNREAD_ICON_SIZE = 16;
     public const int STAR_ICON_SIZE = 16;
     
@@ -33,17 +30,9 @@ public class IconFactory {
     
     // Creates the icon factory.
     private IconFactory() {
-        icon_theme = Gtk.IconTheme.get_default();
         icons_dir = GearyApplication.instance.get_resource_directory().get_child("icons");
-        
-        append_icons_search_path(null);
-        append_icons_search_path("128x128");
-        append_icons_search_path("48x48");
-        append_icons_search_path("24x24");
-        append_icons_search_path("16x16");
-        
-        // Load icons here.
-        application_icon = load("geary", APPLICATION_ICON_SIZE);
+        icon_theme = Gtk.IconTheme.get_default();
+        icon_theme.append_search_path(icons_dir.get_path());
     }
 
     public void init() {
@@ -80,31 +69,6 @@ public class IconFactory {
         return new FileIcon(icon_file);
     }
 
-    private void append_icons_search_path(string? name) {
-        if (Geary.String.is_empty(name))
-            icon_theme.append_search_path(icons_dir.get_path());
-        else
-            icon_theme.append_search_path(icons_dir.get_child(name).get_path());
-    }
-    
-    private Gdk.Pixbuf? load(string icon_name, int size, Gtk.IconLookupFlags flags = 0) {
-        // Try looking up IconInfo (to report path in case of error) then load image
-        Gtk.IconInfo? icon_info = icon_theme.lookup_icon(icon_name, size, flags);
-        if (icon_info != null) {
-            try {
-                return icon_info.load_icon();
-            } catch (Error err) {
-                warning("Couldn't load icon %s at %s, falling back to image-missing: %s", icon_name,
-                    icon_info.get_filename(), err.message);
-            }
-        } else {
-            debug("Unable to lookup icon %s, falling back to image-missing...", icon_name);
-        }
-        
-        // Default: missing image icon.
-        return get_missing_icon(size, flags);
-    }
-    
     // Attempts to load and return the missing image icon.
     private Gdk.Pixbuf? get_missing_icon(int size, Gtk.IconLookupFlags flags = 0) {
         try {

src/client/components/main-window.vala

@@ -64,13 +64,6 @@ public class MainWindow : Gtk.ApplicationWindow {
         spinner.set_progress_monitor(progress_monitor);
         progress_monitor.add(conversation_list_store.preview_monitor);
 
-        GLib.List<Gdk.Pixbuf> pixbuf_list = new GLib.List<Gdk.Pixbuf>();
-        pixbuf_list.append(IconFactory.instance.application_icon);
-        // Use copy() because set_default_icon_list() actually accepts an owned reference
-        // If we didn't hold the pixbufs in memory, would need to use copy_deep()
-        // See https://mail.gnome.org/archives/vala-list/2014-August/msg00022.html
-        set_default_icon_list(pixbuf_list.copy());
-        
         delete_event.connect(on_delete_event);
         key_press_event.connect(on_key_press_event);
         key_release_event.connect(on_key_release_event);

src/client/notification/libnotify.vala

@@ -197,8 +197,7 @@ public class Libnotify : Geary.BaseObject {
         if (error_notification != null)
             return;
 
-        error_notification = issue_notification("email", summary, body,
-            IconFactory.instance.application_icon, null);
+        error_notification = issue_notification("email", summary, body, null, null);
     }
 
     public void clear_error_notification() {