Related to a Hunspell 1.3 bug (missing morphological analysis of compound words: http://sourceforge.net/tracker/?func=detail&atid=756395&aid=3544994&group_id=143754), some optional features of the Hungarian grammar checker (eg. "Underline all generated compound words") don't work in LibreOffice.
Fixed in Hunspell CVS, also in a LibreOffice patch (tested by the morphological analysis of 1.8 million Hungarian words).
Test in LibreOffice:
Choose Settings of Extension Manager -> Hungarian dictionary extension, and set "Underline all generated compound words" option.
The word "macskakutya" in a Hungarian document will be underlined by blue wavy line.
Laszlo Nemeth committed a patch related to this issue.
It has been pushed to "master":
fdo#55045 fix broken Hungarian grammar checking options
The patch should be included in the daily builds available at
http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More
information about daily builds can be found at:
Affected users are encouraged to test the fix and report feedback.