add-license-headers strips whitespace

[klmcadams]

🔍 Before submitting the issue

• I have searched among the existing issues
• I am using a Python virtual environment

🐞 Description of the bug

The hook strips whitespace on the lines we copy over from before the hook was run. We use rstrip, so I think if I strip only ('\n') instead, that could solve the problem.

This is an issue bc it can fail the hook if the header hasn't changed but the trailing whitespace was removed

📝 Steps to reproduce

Add trailing whitespace to a line in a file, and run the hook (pre-commit run --file file_name --verbose)

💻 Which operating system are you using?

Windows

📀 Which ANSYS version are you using?

No response

🐍 Which Python version are you using?

3.10

📦 Installed packages

N/A