ThunarSendtoModel cannot check whether a GAppInfo support multiple file arguments, so send-to actions might fail in some situations

ThunarSendtoModel cannot check whether a GAppInfo supports content type of a file, so send-to actions might fail in some situations

ThunarChooserDialog cannot check whether a GAppInfo is usercreated because there's no function for that in GIO

Thunar crashes when in /media/disk and unmounting that volume with exo-unmount.

Dragging links into a folder always fails to create the desktop file.

Renaming a file will remove it from ThunarRenamerModel because it's issued as a file-destroyed signal. Need to handle the rename/move case better in ThunarFile.