unmount blocking condition not recognized in warning dialog (automatic closing fails)

When unmounting isn't possible due to a blocking condition (usually an open file), nautilus displays a warning dialog listing the conditions/applications which have open files under the mount path. When the files are closed, nautilus doesn't recognize that and keeps displaying the dialog while in the background the unmounting takes place and one has to select `Abort` or `Unmount nevertheless` in order to close the dialog.

In case it is intended to not simply let a dialog disappear because it might be bad user feedback the content of the dialog should change explaining what just happened (that there's been a blocking condition which has in the meantime be resolved and that the dialog can be closed without any effect). Of course there then needs to be an option which allows control over whether the dialog's content's changed or whether it disappears.

Steps to reproduce:

  * Mount an USB connected or another external device, open a terminal and change the directory to the mount point (usually `/media/$USER/<uuid of filesystem>`)
  * press the `eject` button for the filesystem; a warning is displayed that applications are still using the device and list contains `gnome-terminal` or `Terminal`)
  * type `cd` in the terminal and see how the unmounting takes place in the file view of `nautilus`, but the dialog persists

experienced with 3.10.1; worked like a charm with a previous unknown version.

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: nautilus 1:3.10.1-0ubuntu15
Uname: Linux 3.17.4-031704-generic x86_64
NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Dec 6 05:44:31 2014
GsettingsChanges: b'org.gnome.nautilus.list-view' b'default-column-order' b"['name', 'size', 'type', 'date_modified', 'date_accessed', 'owner', 'group', 'permissions', 'mime_type', 'where']"
SourcePackage: nautilus
UpgradeStatus: No upgrade log present (probably fresh install)