Locking __materialLibrary__ or materials and textures in Navigator take no effect

Steps to reproduce:

• Open a 3D project
• Create new texture by clicking + in Material Browser -> Textures
• Lock _materialLibrary_ , defaultMaterial and texture in Navigator by clicking the lock icon beside the components
• -> Materials can still be created, deleted and edited in Material Browser, Material Editor and Texture Editor
• _materialLibrary_ is by default hidden in Navigator. If user should be able to lock materials and textures, maybe there should be a way to do in using Material Browser and/or Material/Texture Editors?