disableHeartBeatTimer doesn't really removes event listeners #14586
Description
In piwik.js:
setUpHeartBeat() attaches to 'focus' and 'blur' window events without capture:
addEventListener(windowAlias, 'focus', heartBeatOnFocus);
addEventListener(windowAlias, 'blur', heartBeatOnBlur);
But disableHeartBeatTimer() removes those events with capture (third parameter):
windowAlias.removeEventListener('focus', heartBeatOnFocus, true);
windowAlias.removeEventListener('blur', heartBeatOnBlur, true);
So event listeners are not really removed and script continue to send ping requests.