file transfer, drag and drop, confirmation

[qsorix@…]

Hello,

In my humble opinion a confirmation dialog should be displayed after dropping a file on a contact in the roster.

It should show what you want to transfer and to whom. Sending a file disturbs recipient so it should be hard to send something accidentally, i.e. if you drop it on a wrong person.

Regards, Thomas 'QsoRiX' Rydzynski

[asterix]

(In [8016]) show a confirmation dialog when we drop a file on a contact before sending files. fixes #2896