web-IDE: Space in new branch gives a misleading "Branch has changed" error

Summary

During commit a space in new branch gives a misleading error

Steps to reproduce

• Open a file in webIDE
• Commit change while selecting new branch
• Enter invalid branch name with space

Example Project

Gitlab.com

What is the current bug behavior?

Displays the following error message:

Branch has changed
This branch has changed since you started editing. Would you like to create a new branch?

What is the expected correct behavior?

Displays the following error message:

Invalid Branch Name
Spaces are not allowed in branch names. See here for more info: example

Relevant logs and/or screenshots

Output of checks

This bug happens on GitLab.com

Possible fixes