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Option to overwrite only changed files

Merged Administrator requested to merge github/fork/wheezil/1391-jel into master

Created by: wheezil

PR checklist

  • Read the contribution guidelines.
  • Ran the shell script under ./bin/ to update Petstore sample so that CIs can verify the change. (For instance, only need to run ./bin/{LANG}-petstore.sh, ./bin/openapi3/{LANG}-petstore.sh if updating the {LANG} (e.g. php, ruby, python, etc) code generator or {LANG} client's mustache templates). Windows batch files can be found in .\bin\windows\.
  • Filed the PR against the correct branch: master, 3.4.x, 4.0.x. Default: master.
  • [NA] Copied the technical committee to review the pull request if your PR is targeting a particular programming language.

Description of the PR

Add option --minimal-overwrite which will cause output files to be written to a temp file, compared to any existing file, and if different renamed. On build systems (such as MSBuild) that was weak dependency rules, this can help to prevent triggering of massive recompile on every build.

This resolves conflicts with changes from other authors in which new File() was replaced by Paths.get(), I kept the Paths.get() updates where applicable.

Related PRs: #1397, #1391