keyboard applet: Allow flag icon to properly scale its size to match

the panel and preferences.  Monkey patch some St.Icon methods to
the EmblemedIcon class so we can use the existing applet icon sizing
calculations by pretending we're just another icon hanging around,
getting things done.

files/usr/share/cinnamon/applets/keyboard@cinnamon.org/applet.js

@@ -31,7 +31,7 @@ EmblemedIcon.prototype = {
     _style_changed: function(actor) {
         let icon_size = 0.5 + this.actor.get_theme_node().get_length("icon-size");
 
-        this.actor.width = this.actor.height = icon_size;
+        this.actor.natural_width = this.actor.natural_height = icon_size;
     },
 
     _repaint: function(actor) {
@@ -79,6 +79,22 @@ EmblemedIcon.prototype = {
                                                         this.id);
 
         cr.$dispose();
+    },
+
+    /* Monkey patch St.Icon functions used in js/ui/applet.js IconApplet so
+       we can use its _setStyle() function for figuring out how big we should
+       be
+     */
+    get_icon_type: function() {
+        return St.IconType.FULLCOLOR;
+    },
+
+    set_icon_size: function(size) {
+        this.actor.width = this.actor.height = size;
+    },
+
+    set_style_class_name: function(name) {
+        return;
     }
 }
 
@@ -241,7 +257,6 @@ MyApplet.prototype = {
 
         this.set_applet_tooltip(this._config.get_current_name());
 
-        let actor = null;
         let handled = false;
 
         if (this.show_flags) {
@@ -250,9 +265,11 @@ MyApplet.prototype = {
             let file = Gio.file_new_for_path("/usr/share/iso-flag-png/" + name + ".png");
 
             if (file.query_exists(null)) {
-                actor = new EmblemedIcon(file.get_path(), this._config.get_current_flag_id(), "applet-icon").actor;
+                this._applet_icon = new EmblemedIcon(file.get_path(), this._config.get_current_flag_id(), "applet-icon");
+                this._applet_icon_box.set_child(this._applet_icon.actor);
+
+                this._setStyle();
 
-                this._applet_icon_box.set_child(actor);
                 this.set_applet_label("");
 
                 handled = true;