C-c a @: copy file + line range only for regions longer than 5 lines

[Copilot]

The C-c a @ copy actions always prepended the full selected region text to the context reference, producing unwieldy clipboard content for large selections. Long selections now copy only the file path with line range; the region text is kept for selections of 5 lines or fewer.

Changes

• ai-code-file.el
  • ai-code-copy-buffer-file-name-to-clipboard: include region text only when the region spans at most ai-code-region-text-max-lines; otherwise copy just the file#Lstart-Lend reference. Applies to both "Copy context" and "Copy context with full path".
  • New defcustom ai-code-region-text-max-lines (default 5) controlling the threshold.
  • "Add context" needed no change — it already stores line-range references only via ai-code--current-file-context-reference.

Behavior

;; Region of 5 lines (unchanged):
;; => "l1\nl2\nl3\nl4\nl5 in /tmp/sample.el#L1-L5"

;; Region of 6 lines (new):
;; => "/tmp/sample.el#L1-L6"

• test/test_ai-code-file.el: new ERT tests covering the ≤5-line path (text preserved), the >5-line path (line range only), and both copy sub-menu entries via ai-code-context-action.

• Fixes Fix: For C-c a @, when the selected region is more than 5 lines, just use the file + line range #513

[Copilot]

🟢 Approval recommended

The implementation is focused and tested; only a minor documentation correction remains.

Pull request overview

Adds configurable suppression of large selected-region text in copied context references.

Changes:

• Introduces a configurable five-line default threshold.
• Adds ERT coverage for short/long regions and both copy actions.
• One minor docstring issue was noted.

File summaries

File	Description
ai-code-file.el	Applies the region-length threshold when copying context.
test/test_ai-code-file.el	Tests threshold behavior and context-menu actions.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 1
• Review effort level: Balanced

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