Design mode: Give IEditor a 'preferred mode'.
... and switch to it in EditorManager::activateEditor. There no longer is a need for special currentEditorChanged() handling in the editor that use a special mode. QmlDesigner receives an additional setting specifying the desired edit mode. QmlJSEditor detects whether QmlDesigner is present by checking the registered mimetypes of the Design mode and retrieves the settings via keys. Remove some obsolete code and clean up includes on qmldesignerconstants.h Reviewed-by: con