Copying wrapped GitHub Copilot CLI output can turn `var c` into `varc`

[zuntan]

Describe the bug

Summary:
Copying wrapped output from GitHub Copilot CLI sometimes removes spaces from the clipboard text.

The issue is especially noticeable in long code output. For example, when a TypeScript fragment such as var c = ""; appears inside a long generated code block, and the visual line wrap occurs at the space between var and c, the copied clipboard text may become varc = "";.

Expected behavior:
Copied text should preserve the exact output, including spaces.

Example expected text:
var c = "";

Actual copied text:
varc = "";

Impact:
This changes the TypeScript code. var c = ""; is a variable declaration, while varc = ""; is an assignment to an identifier named varc. The copied code may fail to compile or behave differently from the generated code.

Additional observation:
I asked Copilot CLI to produce the same code in two ways:

1. Write the code directly to a file.
2. Print the same code to the terminal output.

The file output preserves spaces correctly.
The text copied from the terminal output sometimes loses spaces, especially around visual line-wrap positions.

This suggests that the generated code itself is correct, and the issue is likely in the terminal rendering/copy/clipboard path.

Reproduction steps:

1. Start GitHub Copilot CLI.
2. Ask it to output relatively long TypeScript code with long lines and spaces between tokens.
3. Ensure that a fragment like var c = ""; is visually wrapped at the space between var and c.
4. Also ask it to write the same code directly to a file.
5. Copy the code from the Copilot CLI terminal output.
6. Copy the code from the generated file.
7. Paste both into plain text files.
8. Compare the pasted text.

Example diff:

• var c = "";

• varc = "";

Environment:
GitHub Copilot CLI version:
OS:
Terminal:
Shell:
Terminal width:
tmux/screen:
Node.js version:
npm version:

Notes:
The issue appears more frequently with longer code output and visual word wrapping. In the observed case, the missing space was exactly the space between the TypeScript keyword var and the identifier c.

Affected version

No response

Steps to reproduce the behavior

No response

Expected behavior

No response

Additional context

No response

[examon]

This should be resolved as of v1.0.49. Copying soft-wrapped output from the CLI's scroll view now rejoins continuation lines while preserving the space at word boundaries, so var c no longer collapses into varc. If you are on an older build, updating to a current version should pick up the fix. If you still see this on a recent version, please comment with details and we'll take another look.

[zuntan]

Thanks. I am already on GitHub Copilot CLI 1.0.59. I will re-check whether the issue still reproduces.

[zuntan]

I can provide environment details, but I cannot share the original bookmarklet code or spend more time preparing a sanitized reproduction case.

Additional detail: the missing space occurred at the second soft-wrap boundary, not the first one. The first soft-wrap boundary preserved the space correctly, but at the second boundary var c became varc.

The original code was a JavaScript bookmarklet. It is essentially a single very long logical line, about 1500 characters long. In the terminal, it is displayed as multiple visual lines due to soft wrapping.

Environment:
GitHub Copilot CLI version: 1.0.59
OS: Windows
Terminal: Alacritty 0.17.0
Terminal multiplexer: zellij 0.44.3
Shell: PowerShell
Terminal size: 195 columns x 46 rows
tmux/screen: no, but zellij is used

I hope these details are still useful.