Can not checkout to another branch via the status bar action

[vinokurig]

Describe the bug

When trying to checkout to another branch by running the status bar action (a button with the current branch name) and selecting a branch from the drop-down list, a message asking to input a new branch name is shown.

Che version

• latest
• nightly
• other: please specify

Steps to reproduce

1. Start a workspace with any project cloned from GitHub e.g. https://github.com/testmagic-123/test.git.
2. Create a new branch.
3. Checkout to a previous branch by clicking the branch status bar action:
   
   and selecting the previous branch from the drop-down list.
4. See:
   

Expected behavior

Git checkout to the selected branch.

Runtime

• kubernetes (include output of kubectl version)
• Openshift (include output of oc version)
• minikube (include output of minikube version and kubectl version)
• minishift (include output of minishift version and oc version)
• docker-desktop + K8S (include output of docker version and kubectl version)
• other: (please specify)

Screenshots

Installation method

• chectl
  • provide a full command that was used to deploy Eclipse Che (including the output)
  • provide an output of chectl version command
• OperatorHub
• I don't know

Environment

• my computer
  • Windows
  • Linux
  • macOS
• Cloud
  • Amazon
  • Azure
  • GCE
  • other (please specify)
• other: please specify

Eclipse Che Logs

Additional context

[vinokurig]

Should be fixed by eclipse-theia/theia#6221