Why does thunar assume that i want to copy on dragndrop? This should be and option under prefs imho. If you mark this invalid, please explain why.
Well, the reason is simply consistency with all other GTK applications. If this should be made an option, it should be an option available to all GTK apps (and used in all GTK apps).
Are there giudelines for this, or is it just that the first GTK filemanager had copy-on-dragndrop, and everyone followed? I belive that consistency is good, but freedom of choice is more important. And if you leave copy as default it would still be consist. You do a really good job, keep it up ;)
It's not only for filemanagers, its for all GTK apps that support any kind of DnD: Copy is default, hold down shift to Move. I'll look into adding an option.
Improved with revision 21260. 2006-04-26 Benedikt Meurer <benny@xfce.org> * thunar/thunar-file.c(thunar_file_accepts_drop): Be a bit smarter in guessing the default action for a folder drop operation. For example it will default to move now if both the source and the target are on the same disk and the user owns the source files.