Merge branch 'js/ort-clean-up-after-failed-merge' into maint

Plug memory leaks in the failure code path in the "merge-ort" merge strategy backend. source: <pull.1307.v2.git.1659114727.gitgitgadget@gmail.com> * js/ort-clean-up-after-failed-merge: merge-ort: do leave trace2 region even if checkout fails merge-ort: clean up after failed merge