Pasting zero-width characters into PyREPL results in incorrect cursor position
Open
Nobody has claimed this yet.
stdlib
topic-repl
type-bug
- Dominant language
- Python
- Stars
- 77.2k
- Forks
- 35.9k
- PR merge metrics
- PR metrics pending
Description
Bug report
Bug description:
To reproduce
Tested with Python 3.14 rc3 on Linux
- Open the new REPL
- Paste: ééééé
The paste-able string above is five letter 'e's each followed by \u0301. To create it use:
print('e\u0301' * 5)
The \u0301 is a combining mark with zero-width display length
Current behavior
The cursor position is five spaces after the pasted string
Expected behavior
The cursor position is immediately after the pasted string
CPython versions tested on:
3.14
Operating systems tested on:
Linux
Linked PRs
- gh-139254
- gh-140796
- gh-141166
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the new REPL reproduction on Linux, pasting the combining-mark string described in the issue and checking the cursor position afterward. Review the linked PRs gh-139254, gh-140796, and gh-141166 before taking action; done means the cursor is immediately after the pasted string.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- cli
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Clearly specified
- Newbie friendliness
- 35/100