Since the order of the layers can potentially impact the build outcome, users should be able to reorder the layers within the layers dialog.
patch merged to master
Verified on e9e3285e1397cfd2d34f4eb7b5aa59311eea861d I am marking this as verified, since the fix does exactly what was requested in the bug. I think there are some enhancements we can make to reveal the reordering functionality (currently nothing tells me I can reorder layers) and to indicate the drop target, but I'll file separate bugs for those at some point.