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Strips trailing whitespace and adds a trailing newline when an editor is saved.
To disable/enable features for a certain language package, you can use syntax-scoped properties in your config.cson. E.g.
'.slim.text':
whitespace:
removeTrailingWhitespace: falseYou find the scope on top of a grammar package's settings view.
Note: for .source.jade, .source.diff, .source.pug and .source.patch, removing trailing whitespace is disabled by default.