accelerate

b2a95020 - FIX: patch_environment restores pre-existing environment variables when finished (#1960)

FIX: patch_environment restores pre-existing environment variables when finished (#1960) Resolves #1832 This fixes a bug in patch_environment that currently leads to pre-existing items being deleted completely from the environment variables, when they were temporarily modified by patch_environment, once the context has finished. Now, the env vars are restored to their previous values.