Change Details

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

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. Also, make the `KFilePlacesModel` static and shared between all Folder View instances.

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. MoreoverAlso, listen to changes inmake the `KFilePlacesModel` static and update the label if neededshared between all Folder View instances.