Browsing view - keep the same % ratio for panels

[phaolo]

I resize or move XnviewMp's window a lot (e.g: to other screens, also vertical).
The problem is that the program doesn't keep the ratio of the panels in the browsing view.
So, panels on the right become too small or too large every time, and I have to resize the left ones (until the next move).
For example I always show folders-preview-filelist horizontally, and the filelist gets cut off on the vertical monitor.

Could you add an option to keep the same % on resize?