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Remove leading comment-only and blank lines only when the first remaining line is a cell magic. Apply the cleanup after prompt stripping so pasted transcripts use the same transformation and completeness rules. Preserve ordinary Python input and cell-magic bodies. Document the changed interpretation of programmatically registered line magics named with a leading percent sign. Fixes ipython#15312 🤖🤖 Prepared with AI assistance. Signed-off-by: Mingyang Wu <129849514+aprylewu@users.noreply.github.com>
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A comment before a cell magic currently sends it through the line-magic parser. For example:
Add a cleanup transform that removes leading comment-only and blank lines when the next line starts with
%%. Run it after both prompt strippers so pasted Python and IPython transcripts receive the same treatment. Preserve the magic body and leading comments in ordinary Python or line-magic cells.Add regressions for pasted prompts, indentation, help syntax, cell-completion checks, body preservation, and execution through
InteractiveShell. The release note documents the change for programmatically registered line magics whose names begin with%.This follows the cleanup approach discussed in #15312 and the unmerged #15316.
Fixes #15312
🤖🤖 Prepared with AI assistance.