[IconMenu] add a popoverStyle property

[zsxsoft]

Firstly, code here:

      <IconMenu
        iconButtonElement={
          <IconButton tooltip='xxxxx'>
            <Notifications />
          </IconButton>
        }
      >
        <MenuItem xxxxxx />
        <MenuItem xxxxxx />
      </IconMenu>

The children of <IconMenu> was wrapped in PopoverDefaultAnimation > Paper > div > div > div.

As the screenshot, I want to set the top attribute in style of PopoverDefaultAnimation > Paper > div, and the source code's here: https://github.com/jareddellitt/material-ui/blob/b59a89a8d737ab3e2e8f2d91380144dcc6efca13/src/Popover/PopoverAnimationDefault.js#L96.

I found it's no way to set props of this, so that I can't customize the style.
Is there any workaround? And is there a plan to support it?

[oliviertassinari]

You are right, we don't expose any property to do it. We would accept a PR for that.

[dingjibang]

+1