Why do you think the severity is so important that it needs to be backported? My understanding is that the full text search is buggy but the IDE can be executed and used generally. It is not a show stopper. The better thing to do would be asking upstream if they want to do a minor 3.12.3 release.
- Bug#922401: Fix how format on load & save option is... PICCORO McKAY Lenz
- Bug#922401: Fix how format on load & save opti... Bastian Germann