Crash of file-browser when going out of app's sandbox

[phofman]

The internal file-browser (the one that let's you pick-up a file to load or save) crashes the whole application when ".. (Parent directory)" is clicked too many times. More precise: when ".." is clicked being in application's main sandbox folder (containing "app", "data", "db", "logs", "shared", "tmp").

I suspect that the reason is the security exception not properly handled.