Limit 'file name' column's width %

[thibaultmol]

When it needs to list atleast one really long file name. It might happen that the File Name column gets so wide that it causes the 'Path' column to not even visible without scrolling.
Might be confusing to people who don't realize the box has a horizontal scrollbar.

I'd suggest forcing a max % width on the File Name column so that Path is always visible atleast. (people can manually change the width of course, but default should be that percentage i think)