* use it in MetadataListView and GraphEditor 'add Node' menu
* GraphEditor: forward MenuItem key events to searchBar to be able to continue editing the filter even if it lost active focus
Add a button to copy the textual content of a MessageDialog to the clipboard.
* use hidden TextEdit to perform the copy operation
* add function to modify this text in inherited components
* move icon to title
* display and allow to upgrade incompatible nodes after project loading
* add a ToolButton in main toolbar to open CompatibilityManager in case of compatibility issues
* display selectable-by-mouse source filepath
* add radius property to FloatingPane to control border radius from outside
* use FloatingPane in ImageMetadataView