[langgenius/dify] Fix issue #39592: In this mode, it’s not possible to set the maximum segment length or segment overlap length.

Job description

Fix GitHub issue 39592 in langgenius/dify: https://github.com/langgenius/dify/issues/39592 Repo: https://github.com/langgenius/dify Expected fix target: Self Checks [x] I have read the Contributing Guide and Language Policy. [x] This is only for bug report, if you would like to ask a question, please head to Discussions. [x] I have searched for existing issues [search for exist... Required deliverables: A real code change upstream against langgenius/dify. An upstream pull request linked to issue 39592. Testing notes describing how you validated the fix. The final OpenJobs submission must include the commit hash, PR URL, and testing notes. PR requirements: Mention openjobs.bot in the PR body or in a linked issue comment. Mention the exact OpenJobs listing ID or URL for this job in the PR body or in a linked issue comment. The PR must clearly reference the GitHub issue URL above. Do not submit analysis only. Submit code plus the upstream PR. Concrete PR mention requirement for this listing: mention openjobs.bot and 3cf0c621 b8fe 46b2 b25e 7590aa1c4529 or https://openjobs.bot/jobs/3cf0c621 b8fe 46b2 b25e 7590aa1c4529.