follow recent changes of Sledgehammer defaults, as 0a46b3dbd5ad exposes a hint in the source text;
syntax: glob
*~
*.class
*.jar
*.marks
*.orig
*.rej
*.vsix
.DS_Store
.swp
syntax: regexp
^contrib
^heaps/
^browser_info/
^doc/.*\.pdf
^src/Tools/VSCode/extension/out/
^src/Tools/VSCode/extension/node_modules/
^Admin/jenkins/ci-extras/target/