[Backport release-3_38] Fix CRS flagged as invalid from standalone code #58565
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Correctly handle the situation where multiple QgsCoordinateReferenceSystemRegistry objects are created. This can happen when something tries to create a CRS before the QgsApplication is properly constructed. In this situation the std::once calls were incorrectly causing the member cached objects to only be populated for the FIRST registry created. Move to static objects were possible, and use a local mutex to protect other create-once, registry specific caches. Fixes #55161
rouault
approved these changes
Sep 3, 2024
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Backport #58556
Authored by: @nyalldawson