Changes
* Fixed an issue, where no visual feedback was given when clicking on Child Items.
* Fixed an issue where files are downloaded unnecessarily for documents being deleted.
* Fixed an issue where ContentViewModel.EditPropertyValueCommand did not check a property's editability before allowing a user to edit it.
* Fixed an issue where PropertyListViewModel.EditableItems previously incorrectly returned those that are defined uneditable by user rights. (Existing Xaml customizings will need to be adapted for this.)
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