Leave CSS fullscreen optimization applied

Do not apply and remove fullscreen optimization class when going/leaving fullscreen. Instead set it to be applied to fullscreen only with CSS.

css/styles.css

@@ -314,7 +314,7 @@ radio {
 .gpufriendly {
   box-shadow: -8px -8px transparent, 8px 8px transparent;
 }
-.gpufriendlyfs {
+.fullscreen.gpufriendlyfs {
   box-shadow: none;
 }
 

src/appBase.js

@@ -34,6 +34,8 @@ class ClapperAppBase extends Gtk.Application
 
         if(!settings.get_boolean('render-shadows'))
             window.add_css_class('gpufriendly');
+
+        window.add_css_class('gpufriendlyfs');
     }
 
     vfunc_activate()

src/widget.js

@@ -142,10 +142,6 @@ class ClapperWidget extends Gtk.Grid
         debug('changing fullscreen mode');
         this.isFullscreenMode = isFullscreen;
 
-        const root = this.get_root();
-        const action = (isFullscreen) ? 'add' : 'remove';
-        root[action + '_css_class']('gpufriendlyfs');
-
         if(!isFullscreen)
             this._clearTimeout('updateTime');