Pasting zero-width characters into PyREPL results in incorrect cursor position

Bug report

Bug description:

To reproduce

Tested with Python 3.14 rc3 on Linux

1. Open the new REPL
2. 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

先在 Linux 上进行新的 REPL 复现，粘贴 issue 中描述的组合标记字符串，然后检查光标位置。采取行动前先查看链接的 PR gh-139254、gh-140796 和 gh-141166；完成的标准是光标紧接在已粘贴字符串之后。