Up popping Sub Categories in Material Instance

Hey guys,

atm. i use 4.7 but i think this fits to other versions too. Like the title says, the categories in a Material Instance getting “expand” all the time, when you’re updating the Parent Material.
I think, it would be aweseome if that don’t happen.

So a new Categorie should be created “collapsed” and all the others you “collapsed” before, also should stay collapsed. Maybe its only me, but sometimes i prefer to update my material and check it out in the material instance. But then all categories get
expand again, as soon you “apply” the material.

edit: this also happens on Ctrl+Z.