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fix(client): fix a false positive page reload error in Safari (#3643)
Previous code was susceptible to the race condition in Safari browser. Specifically below piece: ``` iframe.src = policy.createURL(url) karmaNavigating = false ``` There is no guarantee that onbeforeunload event will be triggered synchronously after setting `iframe.src`. It was the case in Chrome and Firefox, but not in Safari, where this caused an error every test run. New approach resets the onbeforeunload handler before navigation is triggered by Karma itself to avoid the need for synchronization and this race condition altogether. The handler will be restored by the new context once it is loaded. PS Code is a bit fragile as there is an implicit dependency on `onbeforeunload` from the context, but I can't think of a cleaner approach.
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