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There could be an extra Tab "Whitespace" in Tools->Options->Fonts&Colors with a listbox on the left with three items: Indentation Whitespace Trailing Whitespace Newline On the right there would be a checkbox whether particular highlight is applied or not and a highlight configuration like under "Syntax" tab. However I somewhat resist to put this under Syntax tab since it's not related to syntax of the language and it would not be turnable on/off. Highlighting tab does not offer font (or effects) change which could be beneficial here since it would be applied to the font of non-visible chars display.
Current solution are items in Tools->Options->Fonts&Colors->Highlighting tab: Indentation Whitespace Trailing Whitespace When assigning background colors to them the indentation/trailing whitespace will start to be shown. http://hg.netbeans.org/jet-main/rev/4e035f03b6eb
Integrated into 'main-golden', will be available in build *201305172300* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main-golden/rev/4e035f03b6eb User: Miloslav Metelka <mmetelka@netbeans.org> Log: #225747 - Allow more detailed control of whitespace and newline highlighting.
*** Bug 205854 has been marked as a duplicate of this bug. ***
*** Bug 205247 has been marked as a duplicate of this bug. ***