QGIS multiple whitespace in attributes are removed after restart

Concerning this question: http://ift.tt/1Luh3RG

I have an issue with the saving of Strings with multiple whitespace in the Attributes. Let's say I want to save S e a it is fine, also after restart of QGIS.

But when I save S e a. After restart I get S e a. I really need the whitespaces at the specific count as you can see from the link above.

So I tried to save "S e a". That is working somehow! But in the Geojson I now get \"S e a\". Puh. That's bad...

So how can I safe multiple whitespaces that are not lost after QGIS restart?