I am not sure. I know a lot of the material work has been put on the back burner and scrollbars weren't the super highest priority for us anyway. I also know Jetbrains was also looking into implementing them, but again has a few other things they're working on. I do know it is something we want to support, but all this is to say that I don't think anyone is actively working on them at the moment so it's a bit difficult to predict an ETA.