[PR] Restore outer ApplicationContext after nested execution [burr]

["MrlixiangWE (via GitHub)" <gi...@apache.org>]

MrlixiangWE opened a new pull request, #867:
URL: https://github.com/apache/burr/pull/867

   Problem
   
   `ApplicationContext.__enter__()` sets the current context, but
   `ApplicationContext.__exit__()` clears it to `None`. When one Burr application
   runs inside another application's action, exiting the inner context removes the
   outer current context even though the outer application is still running.
   
   Before / after
   
   Before:
   
   - After `inner_app.run()` returns, `ApplicationContext.get()` in the outer
     action returns `None` instead of the outer application's context.
   
   After:
   
   - Each entered scope restores the exact preceding `ContextVar` value when it
     exits.
   - Nested, reentrant, and concurrent context-manager uses retain task-local
     restoration tokens.
   
   Verification
   
   - `.venv/bin/pytest tests/core/test_application.py -k 'context' -q`
     (15 passed, 126 deselected)
   - `.venv/bin/pytest tests/core --ignore=tests/core/test_graphviz_display.py -q`
     (393 passed; Graphviz display tests were excluded because this local
     environment lacks `dot`)
   - `.venv/bin/pre-commit run --files burr/core/application.py tests/core/test_application.py`
     (passed)
   - `.venv/bin/python -m build` (passed)


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Re: [PR] Restore outer ApplicationContext after nested execution [burr]

["MrlixiangWE (via GitHub)" <gi...@apache.org>]

MrlixiangWE closed pull request #867: Restore outer ApplicationContext after nested execution
URL: https://github.com/apache/burr/pull/867


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