[SemTiOne]

In append_only mode, added future imports landed in a later import section, producing a SyntaxError. They now take the early insertion path so they precede all code; files without imports stay untouched, and additions are skipped when frozen executable content precedes placement.

Closes #1970.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.45%. Comparing base (c85a44f) to head (81e2779).
⚠️ Report is 17 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2676   +/-   ##
=======================================
  Coverage   99.44%   99.45%           
=======================================
  Files          41       41           
  Lines        3225     3275   +50     
  Branches      692      702   +10     
=======================================
+ Hits         3207     3257   +50     
  Misses         11       11           
  Partials        7        7           

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[Copilot]

Copilot review overview

🟡 Changes recommended

Early insertion can bypass opt-out directives and still place future imports after non-docstring string expressions.

Review effort: Balanced
Findings: 1 · 1

Open (2)

• Insert future imports before non-docstring string expressions · New
• Honor file-level opt-outs before early future-import insertion · New

What changed in this PR

Fixes future-import placement in append_only mode to avoid invalid late imports.

Changes:

• Detects future additions and inserts them before executable code.
• Preserves import-free and frozen-content files.
• Adds regression coverage for issue #1970.

File	Description
isort/​core.py	Implements early future-import placement.
tests/​unit/​test_regressions.py	Adds append-only regression tests.

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