update ad rotation in millix bar. fix random ad pick

chrome/browser/resources/millix/millix_bar.js

@@ -14,6 +14,7 @@ cr.define('millix_bar', function () {
     let reloadTimeout = undefined;
     let fetchAdvertisementTimeout = undefined;
     const ADVERTISEMENT_ROTATION_TIME = 30000;
+    const ADVERTISEMENT_ROTATION_TIME_EMPTY = 15000;
     let walletLocked = true;
     let unlockFromBar = false;
     const audioDeposit = new Audio('/deposit.mp3');
@@ -76,6 +77,10 @@ cr.define('millix_bar', function () {
 
             $headline.off('click');
             $targetPhrase.off('click');
+
+            clearTimeout(fetchAdvertisementTimeout);
+            fetchAdvertisementTimeout = setTimeout(() => fetchAdvertisement(), ADVERTISEMENT_ROTATION_TIME_EMPTY);
+
         } else {
 
             if ($(".arrow-icon").hasClass('open')) { //ads container not visible
@@ -130,11 +135,16 @@ cr.define('millix_bar', function () {
     }
 
     function fetchAdvertisement() {
+        clearTimeout(fetchAdvertisementTimeout);
+
+        if ($(".arrow-icon").hasClass('open')) { //ads container not visible
+            fetchAdvertisementTimeout = setTimeout(() => fetchAdvertisement(), ADVERTISEMENT_ROTATION_TIME_EMPTY);
+            return;
+        }
+
         millixAPIFrame.contentWindow.postMessage({
             type: 'get_next_tangled_advertisement'
         }, 'chrome-untrusted://millix-ws/');
-
-        clearTimeout(fetchAdvertisementTimeout);
         fetchAdvertisementTimeout = setTimeout(() => fetchAdvertisement(), ADVERTISEMENT_ROTATION_TIME);
     }