Merge branch 'en/merge-recursive-icase-removal'

The code internal to the recursive merge strategy was not fully prepared to see a path that is renamed to try overwriting another path that is only different in case on case insensitive systems. This does not matter in the current code, but will start to matter once the rename detection logic starts taking hints from nearby paths moving to some directory and moves a new path along with them. * en/merge-recursive-icase-removal: merge-recursive: ignore_case shouldn't reject intentional removals