Fix issue when generating video thumbnails from network shares #3265
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I've found that Nemo wasn´t generating video thumbnails whenever I was in a network share (I was using the default ffmpegthumbnailer). I was finding it weird because image thumbnails were fine.
Digging into the code I've found that we are passing the smb:// file uri to the gnome_desktop_thumbnail_factory_generate_thumbnail cinnamon-desktop function, and that in turn is calling g_filename_to_uri whenever it finds a %i in a thumbnailer.
That was exactly the case with ffmpegthumbnailer. Image thumbnailers normally don't use the %i format, but %u instead.
Since g_filename_to_uri doesn´t support anything else than local file:// uri, I've added this code to take care of that and fix the thumbnail generation.