Dolphin can show a removable drive as mounted when it isn't and vice-versa.

[Gordon Lack]

It's trivial to get Dolphin to show a Removable Device as mounted (a green icon) after Dolphin has actually unmounted the drive.

Steps to reproduce:

1. Plugin a removable device. This will show up in Dolphin under "Removable Devices"
2. Click on it to mount it.
3. Open a Terminal on the drive.
4. Right click on the device icon and select "Safely Remove". Because of the open terminal this will fail.
5. Close the terminal.
6. Right click on the device icon and select "Safely Remove" again. The device wil lunmount, but Dolphin will continue to show is as mounted (a green icon).

At this point if you close Dolphin and open up another one then click/right-click+"Safely Remove" will work, but that Dolphin will always show a red (unmounted) icon for the device.

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: dolphin 4:18.04.3-0ubuntu2
ProcVersionSignature: Ubuntu 4.18.0-11.12-generic 4.18.12
Uname: Linux 4.18.0-11-generic x86_64
ApportVersion: 2.20.10-0ubuntu13.1
Architecture: amd64
CurrentDesktop: KDE
Date: Sat Dec 1 01:46:12 2018
InstallationDate: Installed on 2018-05-09 (205 days ago)
InstallationMedia: Kubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
SourcePackage: dolphin
UpgradeStatus: Upgraded to cosmic on 2018-10-26 (35 days ago)