Add shadow root support for isInDOM
Add shadow root support for isInDOM

By getting the "host" property when "parentNode" is undefined, the function can properly climb the DOM tree and allow monaco-editor to be used within a shadow root.
eamodio/vscode,Microsoft/vscode,hoovercj/vscode,the-ress/vscode,joaomoreno/vscode,the-ress/vscode,Krzysztof-Cieslak/vscode,Microsoft/vscode,eamodio/vscode,Microsoft/vscode,the-ress/vscode,microsoft/vscode,hoovercj/vscode,Microsoft/vscode,joaomoreno/vscode,eamodio/vscode,the-ress/vscode,Microsoft/vscode,eamodio/vscode,joaomoreno/vscode,hoovercj/vscode,eamodio/vscode,eamodio/vscode,the-ress/vscode,Microsoft/vscode,Krzysztof-Cieslak/vscode,hoovercj/vscode,hoovercj/vscode,joaomoreno/vscode,Microsoft/vscode,eamodio/vscode,Microsoft/vscode,eamodio/vscode,eamodio/vscode,the-ress/vscode,Krzysztof-Cieslak/vscode,joaomoreno/vscode,joaomoreno/vscode,microsoft/vscode,Krzysztof-Cieslak/vscode,hoovercj/vscode,joaomoreno/vscode,Microsoft/vscode,joaomoreno/vscode,hoovercj/vscode,hoovercj/vscode,microsoft/vscode,Krzysztof-Cieslak/vscode,joaomoreno/vscode,microsoft/vscode,eamodio/vscode,the-ress/vscode,Krzysztof-Cieslak/vscode,Krzysztof-Cieslak/vscode,the-ress/vscode,microsoft/vscode,Microsoft/vscode,the-ress/vscode,joaomoreno/vscode,microsoft/vscode,microsoft/vscode,Krzysztof-Cieslak/vscode,Krzysztof-Cieslak/vscode,joaomoreno/vscode,the-ress/vscode,microsoft/vscode,hoovercj/vscode,eamodio/vscode,hoovercj/vscode,eamodio/vscode,Krzysztof-Cieslak/vscode,hoovercj/vscode,microsoft/vscode,microsoft/vscode,eamodio/vscode,microsoft/vscode,hoovercj/vscode,Krzysztof-Cieslak/vscode,hoovercj/vscode,Microsoft/vscode,Microsoft/vscode,Microsoft/vscode,Microsoft/vscode,joaomoreno/vscode,the-ress/vscode,the-ress/vscode,microsoft/vscode,microsoft/vscode,Krzysztof-Cieslak/vscode,Krzysztof-Cieslak/vscode,joaomoreno/vscode,joaomoreno/vscode,Microsoft/vscode,joaomoreno/vscode,hoovercj/vscode,eamodio/vscode,Microsoft/vscode,hoovercj/vscode,the-ress/vscode,Krzysztof-Cieslak/vscode,Krzysztof-Cieslak/vscode,the-ress/vscode,joaomoreno/vscode,eamodio/vscode,microsoft/vscode,microsoft/vscode,the-ress/vscode,the-ress/vscode,Krzysztof-Cieslak/vscode,microsoft/vscode,joaomoreno/vscode,hoovercj/vscode,Microsoft/vscode,eamodio/vscode,microsoft/vscode,Krzysztof-Cieslak/vscode,eamodio/vscode,hoovercj/vscode