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29dc307111
File names that have lots of spaces look quite ugly when inserted as completions because every space will have a backslash. Add an initial heuristic to decide when to use quotes instead of backslash escapes. Quote when 1. it's not an autosuggestion 2. we replace the token or insert a fresh one 3. we will add a space at the end In future we could relax some of these requirements. Requirement 2 means we don't quote when appending to an existing token. Need to find a natural behavior here. Re 3, if the completion adds no space, users will probably want to add more characters, which looks a bit weird if the token has a trailing quote. We could relax this requirement for directory completions, so «ls so» completes to «ls 'some dir with spaces'/». Closes #5433