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f7e7396c69
This fixes the following deadlock. The C++ functions path_get_config and path_get_data lazily determine paths and then cache those in a C++ static variable. The path determination requires inspecting the environment stack. If these functions are first called while the environment stack is locked (in this case, when fetching the $history variable) we can get a deadlock. The fix is to call them eagerly during env_init. This can be removed once the corresponding C++ functions are removed. This issue caused fish_config to fail to report colors and themes. Add a test.