langchain-core: Fixed trim functions, and added corresponding unit test for the solved issue

[fazam0616]

• Description:

  • Trim functions were incorrectly deleting nodes with more than 1 outgoing/incoming edge, so an extra condition was added to check for this directly. A unit test "test_trim_multi_edge" was written to test this test case specifically.

• Issue:

  • Fixes trim_first_node() and trim_last_node() removes nodes that should not be removed #28411
  • Fixes In the subgraph, when there is a branch point to __end__(or __start__ point to ...), it will lose part of the edges langgraph#1676

• Dependencies:

  • No changes were made to the dependencies

• Unit tests were added to verify the changes.

• Updated documentation where necessary.

• Ran make format, make lint, and make test to ensure compliance with project standards.

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Name	Status	Preview	Comments	Updated (UTC)
langchain	⬜️ Ignored (Inspect)	Visit Preview		Nov 30, 2024 1:13am