Allow popovers to be stacked

[AydanGaite]

Is your feature request related to a problem? Please describe.
Currently, there is no way to stack popovers effectively without them behaving weirdly (closing both when one is closed; removing the backdrop when the top popover closes), so a way to stack multiple would be a useful feature

Describe the solution you'd like
Be able to open a popover inside of a popover