Thunar Leaking ThunarFile objects

Seens on thunar master and 4.16 when build with ./autogen.sh --enable-debug=full:

--- Leaked a total of 4 ThunarFile objects:
--> file:///home/schwinn/software/thunar_test/missing_folder
--> file:///home/schwinn/software/thunar_test
--> file:///home/schwinn/software/thunar_test/bookmark%20(link)
--> file:///home/schwinn/software/thunar_test/bookmark%20(link)/some%20file

Every folder accessed will increase the leakage