The commands "`" and "~" are supposed to produce small and large gaps. However, they are currently exported to MathML as empty <mi> elements, which have zero width. I've prepared a patch to use the MathML element <mspace> instead and will submit it for review.
Created attachment 81264 [details]
Here is a page to compare the old and new MathML code. You can view it in Firefox.
Lets mark it as NEW then :-).
Thanks for reporting and submitting a patch for it!
Marking these bugs assigned since I've already taken them.
Frederic Wang committed a patch related to this issue.
It has been pushed to "master":
fdo#66075 - Formula editor: export blanks as MathML <mspace> elements.
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.
I think this bug can be closed?
Of course it can :). _o_ thank you