I asked one of the Stack Overflow moderators if this question would be on-topic on Stack Overflow, and he confirmed that, because it's about software tools used by programmers, the question would be on-topic.
From the Stack Overflow FAQ:
What kind of questions can I ask here?
Stack Overflow is for professional and enthusiast programmers, people who write code because they love it. We feel the best Stack Overflow questions have a bit of source code in them, but if your question generally covers …
- a specific programming problem
- a software algorithm
- software tools commonly used by programmers
- practical, answerable problems that are unique to the programming profession
emphasis is mine
I'm certain it's off-topic on Project Management SE, but in the interests of not tossing a question back and forth from site to site, I'm going to leave this on PMSE for a few days or until it either accumulates more community close votes or goes unanswered.
While JIRA questions wouldn't necessarily be off-topic on PMSE, what I believe would make this particular question off-topic is the context of the question. You're not asking as a project manager using JIRA or someone using JIRA to report information to a project manager, you're asking as a developer using JIRA doing developer things that a project manager is likely to have zero involvement in. Project managers typically don't use software version control as their role is more in managing the schedule and resources. The development team typically handles all decisions regarding how.
Either way, if you want it moved back to Stack Overflow, just flag it on PMSE and I'll send it back over. Good luck!