[BUG] Command suggestions with line continuations have trailing whitespace after backslashes

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

When Claude suggests a command line to run it puts it on multiple lines with a \ at the end of each line. However the CLI seems to have loads of spaces after the \ so copying that and pasting it into a terminal doesn't work.

What Should Happen?

The script suggested should work when copied and pasted from the terminal.

Error Messages/Logs

$ aws ecs describe-task-definition \                                                                                                                                                              
    --task-definition weaviate-node1-prod \                                                                                                                                                                                     
    --region eu-west-2 \                                                                                                                                                                                                        
    --query 'taskDefinition.containerDefinitions[0].healthCheck'

usage: aws [options] <command> <subcommand> [<subcommand> ...] [parameters]
To see help text, you can run:

  aws help
  aws <command> help
  aws <command> <subcommand> help

aws: error: the following arguments are required: --task-definition

zsh: command not found: --task-definition
zsh: command not found: --region
zsh: command not found: --query

Steps to Reproduce

1. Ask Claude for a command line that will go over more than one line. For example "give me a command line to call the GitHub http API using curl to post a new issue"
2. Copy the output
3. Paste the output into a terminal
4. Fail to run it

Claude Model

Not sure / Multiple models

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

1.1.111

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

IntelliJ IDEA terminal
(Also other terminals such as the one built into MacOS)

Additional Information

_No response_