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052b93329d
This ensures the ICU time zone state is only resync'ed when an actual time zone
change was detected. Without this change the following script will resync the
ICU time zone state in each call to Intl.DateTimeFormat:
```
// js::DateTimeInfo is here in its initial state where no time zone info has
// been retrieved yet.
for (var i = 0; i < 10; ++i) {
// Creating a new Realm triggers a time zone check. Because no time zone
// info is yet available, a forced reset of the ICU time zone state is
// requested.
newGlobal();
// The ICU time zone state was just resetted above, so this call will again
// fetch the current system time zone.
new Intl.DateTimeFormat();
}
```
Differential Revision: https://phabricator.services.mozilla.com/D37248
--HG--
extra : moz-landing-system : lando
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