inheritLocale regression

To reproduce:

Tested on Drupal7
Enable locale/i18n and two languages (ex: English and French)
Enable language-prefix language detection
In CiviCRM, enable multilingual, and two languages

Then use the Drupal language switcher to change the language.

Result: the language only changes if we flush the CiviCRM cache. This is because the cache-flush removes data from civicrm_cache, including some session data.

Bug happens since 5.29, also in 5.30 and master.

cc @haystack @sluc23 @samuelsov (fyi)

Edited Sep 13, 2020 by bgm

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