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REVISION SUMMARY
  When no label is displayed, there's no point in creating a `KFilePlacesModel`
  Also, only emit a change for `displayLabel` when it actually changed.
  Moreover, listen to changes in the `KFilePlacesModel` and update the label if 
needed

TEST PLAN
  - My test partition still has its proper "Device" name (devices are populated 
deferred, so if we didn't listen for changes, creating a model and asking for 
`closestItem` right away would return Root (`/media/foo` is closed to `/`)
  - Reduces the number of `displayLabelChanged` emissions to half on startup
  - Added a Pictures folder view, renamed my Pictures place in Dolphin, label 
updated immediately
  - Verified in GammaRay there's no `KFilePlacesModel` instance in plasmashell 
unless having a Folder View widget on desktop or panel (but not in the default 
containment case)

REPOSITORY
  R119 Plasma Desktop

REVISION DETAIL
  https://phabricator.kde.org/D14426

AFFECTED FILES
  containments/desktop/plugins/folder/labelgenerator.cpp
  containments/desktop/plugins/folder/labelgenerator.h

To: broulik, #plasma, hein
Cc: plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, 
jensreuterberg, abetts, sebas, apol, mart

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