White space

If this option enabled, the editor makes non-printable chars like blanks, tabs and line endings visible.

White Space display in HippoEDIT

In case of a document contains mixed line endings, the editor will show explicit line ending type for every line, to help you distinguish lines with an incorrect line ending.

White Spaces in Mixed mode

The option can be enabled as for specific document with menu View → Editor (file specific) → White Space or for all documents of specific syntax.