Problem

Components from @fluentui/react-components@9 are broken (don't have proper styling) when are using inside portalled components (i.e. dialogs, popovers) from @fluentui/react@8 or @fluentui/react-northstar@9.

Repro

• v8 & v9: https://codesandbox.io/s/v8-v9-no-compat-2nnt7
• v0 & v9: https://codesandbox.io/s/v0-v9-no-compat-vw9e2

Questions

• Do we want to have compat layer at all? I.e. is it our or customer's problem?
• Should compat supported by v7?
• Where to host compat implementation? Outside our repo?
  Note: we have really bad DX/release story with packages that are used across different versions. If we will add support to v7 it will be also cross-branch support.