This is a copy of #236. To summarize, if you create a PR and then edit the PR on the github web interface (e.g. to upload images, add markdown, use the preview etc), git spr update overwrites those changes when you update the PR.

@lukas-mertens suggested this fix, which I'm going to implement:

it would indeed be nice if spr would only replace what it created before. That is pretty easy to do actually and done like that by other tools as well. GitHub supports html comments, so you can just do the following:

All the spr stuff here
<!-- SPR Description End: Don't edit anything inside or it will be lost -->

And then you just do a replace inside those two hardcoded strings.