♻️ Introduce utils.getGTKString()

prefs.js

@@ -45,14 +45,10 @@ var PreferencesDialog = class PreferencesDialog {
     this._settings = ExtensionUtils.getSettings();
 
     // Load the general user interface files.
-    {
-      const dir = utils.isGTK4() ? 'gtk4' : 'gtk3';
-
-      this._builder = new Gtk.Builder();
-      this._builder.add_from_resource(`/ui/common/main-menu.ui`);
-      this._builder.add_from_resource(`/ui/${dir}/prefs.ui`);
-      this._builder.add_from_resource(`/ui/${dir}/generalPage.ui`);
-    }
+    this._builder = new Gtk.Builder();
+    this._builder.add_from_resource(`/ui/common/main-menu.ui`);
+    this._builder.add_from_resource(`/ui/${utils.getGTKString()}/prefs.ui`);
+    this._builder.add_from_resource(`/ui/${utils.getGTKString()}/generalPage.ui`);
 
     // Bind general options properties.
     this.bindSwitch('destroy-dialogs');

src/FireEffect.js

@@ -61,8 +61,7 @@ var FireEffect = class FireEffect {
   static initPreferences(dialog) {
 
     // Add the settings page to the builder.
-    dialog.getBuilder().add_from_resource(
-        `/ui/${utils.isGTK4() ? 'gtk4' : 'gtk3'}/firePage.ui`);
+    dialog.getBuilder().add_from_resource(`/ui/${utils.getGTKString()}/firePage.ui`);
 
     // Bind all properties.
     dialog.bindAdjustment('fire-animation-time');

src/TVEffect.js

@@ -59,8 +59,7 @@ var TVEffect = class TVEffect {
   static initPreferences(dialog) {
 
     // Add the settings page to the builder.
-    dialog.getBuilder().add_from_resource(
-        `/ui/${utils.isGTK4() ? 'gtk4' : 'gtk3'}/tvPage.ui`);
+    dialog.getBuilder().add_from_resource(`/ui/${utils.getGTKString()}/tvPage.ui`);
 
     // Bind all properties.
     dialog.bindAdjustment('tv-animation-time');

src/utils.js

@@ -46,6 +46,10 @@ function isGTK4() {
   return Gtk.get_major_version() == 4;
 }
 
+function getGTKString() {
+  return isGTK4() ? 'gtk4' : 'gtk3';
+}
+
 function isInShellProcess() {
   return window.global && global.stage;
 }