User-Agent:       Mozilla/5.0 (X11; Linux x86_64; rv:9.0.1) Gecko/20100101 Firefox/9.0.1
Build Identifier: Thunar 1.3.0

in thunar i select 10 files, copy, paste to other place, copying, copying, "error: there is no space in destination dir", so why thunar can't count free space before copying? nautilus does so. 

if(destination_free_space<files_need_to_be_pasted_size) { 
echo "warning: not enough space in destination"
cancel();
} else { paste(); }

Reproducible: Always