Set badge count

This is displayed on the launcher icon on linux/mac

// FREEBIE

js/panel_controller.js

@@ -41,10 +41,10 @@
 
     window.setUnreadCount = function(count) {
         if (count > 0) {
-            extension.navigator.setBadgeText(count);
+            window.setBadgeCount(count);
             window.document.title = "Signal (" + count + ")";
         } else {
-            extension.navigator.setBadgeText("");
+            window.setBadgeCount(0);
             window.document.title = "Signal";
         }
     };

main.js

@@ -173,3 +173,7 @@ app.on('activate', function () {
 
 // In this file you can include the rest of your app's specific main process
 // code. You can also put them in separate files and require them here.
+
+ipc.on('set-badge-count', function(event, count) {
+  app.setBadgeCount(count);
+});

preload.js

@@ -8,6 +8,9 @@
   const ipc = electron.ipcRenderer
   window.config.locale_json = ipc.sendSync('locale-data');
 
+  window.setBadgeCount = function(count) {
+    ipc.send('set-badge-count', count);
+  };
   /**
   * Enables spell-checking and the right-click context menu in text editors.
   * Electron (`webFrame.setSpellCheckProvider`) only underlines misspelled words;