Nautilus freezes when opening Properties of media file over ftp

Submitted by vil..@..iki.fi

Link to original bug (#745158)

Description

1. Mount a network share (slow one preferred)
2. Find a file (large one preferred)
3. Right click & choose properties
4. Whole Nautilus is frozen and grays out for few seconds until the properties dialog is opened.

All developers should know never to do potentially slow operations in the application's main loop.

Tested with 100mb mp3 file over sftp connection on Ubuntu 14.10, Nautilus 1:3.10.1-0ubuntu1.

Version: 1.12.x