Kate always strips spaces (blanks) at Line End

as noted, this is my Problem when working with Markdown (*.md) files - kate always strips double spaces (blanks) at End of line upon save.
Despite I set it NOT to do that:

how can I fix this ?
(Note: double blank at end of line will result in line break in rendered Markdown)

problem solved, see https://bugs.kde.org/show_bug.cgi?id=451648