D27024: Solid-device-automounter/kcm: show disconnected known device when disconnecting it

[Méven Car]

meven created this revision.
meven added reviewers: broulik, Plasma.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
meven requested review of this revision.

REVISION SUMMARY
  A user might find odd that when a known device in the UI is unmounted, it disappears.
  Despite the fact that restarting the kcm would show it.

TEST PLAN
  Open `kcmshell5 device_automounter_kcm`
  Plug in a usb stick, set a setting for it and Apply
  Unplug the stick
  
  Before:
  The disconnected usb stick does not appear
  After:
  The usb stick appears at the bottom of the disconnected section
  
  Forget the stick in the UI and Apply
  Plug in the usb stick
  Unplug it
  
  The usb stick is not visible (as before)

REPOSITORY
  R119 Plasma Desktop

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D27024

AFFECTED FILES
  solid-device-automounter/kcm/DeviceModel.cpp

To: meven, broulik, #plasma
Cc: plasma-devel, Orage, LeGast00n, The-Feren-OS-Dev, jraleigh, zachus, fbampaloukas, GB_2, ragreen, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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