Created attachment 6109 
thunar1.png

Thunar 1.6.3 in Xubuntu 14.10

I created some nested directories with long names to see how Thunar would handle them:

$ mkdir -p vfdcfr/mmmmmmmmmmmmmmmkkkkkkkkkkkkkkkhhhhhhhhhhhhhhhwwwwwwwwwwwwpppppppppppppppp/ttttttttttttttttttttttttyyyyyyyyyyyyyyyyyyygggggggggggggggggggkkkkkkkkkkkkkkkkkkkkddddddddddddddddd/sssssssssssssssssssssssssssssssssssnnnnnnnnnnnnnnnnnnnnnnnnnnnhhhhhhhhhhhhhhhhhhhhhhhhhhhhcccccccccccc/wwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm

The following three screenshots show the results:

1 (thunar1.png): The whole filename is displayed, necessitating a horizontal scrollbar which hides all columns except for the first. Would it not be better to do what Midnight Commander does, i.e.:
mmmmmmmmmmmmmmm~mmmmmmmmmmmmmm or mmmmmmmmmmmmmm...mmmmmmmmmmmmmm ?

2 (thunar2.png): If I try to delete something, the delete dialogue box goes off the screen, hiding the part of it where the buttons are.

3 (thunar3.png): Once a horizontal scrollbar appears, it remains there unnecessarily after navigating back (or forward) to a directory where it is not required, thus hiding the other columns.