Unable to create Stash branch names containing Japanese, Korean or non-ASCII characters from development panel

If the JIRA issue summary contains non-ASCII characters – Japanese, Korean or even umlaut, then on creating a Stash branch from the development panel, the Stash UI will remove the non-ASCII characters from the proposed branch name.

Environment

How to reproduce

• JIRA is integrated with Stash using Application Links
• Create a JIRA issue with the summary in Japanese, Korean or having non-ASCII characters like umlaut
• From JIRA Development Panel, click on 'Create branch'
• In the Stash create branch screen, the suggested branch name will not contain any of the non-ASCII characters.

Diagnosis

• The Stash URL contains the proper JIRA summary including all characters, but Stash is not able to process the characters (similar to STASH-396). This is still being raised as a JIRA bug, because the error is observed from JIRA.

Workaround

• In the Stash Create Branch screen, copy-paste the JIRA summary as required and then the branch will be created correctly.