How to prevent ReactDOM.render errors from bubbling when otherwise explicitly handled

**Do you want to request a *feature* or report a *bug*?** This is a bug. Ordinarily, this would probably be considered a feature request. However, the stated purpose of the feature referenced below is being violated in certain environments. **What is the current behavior?** React 16+ surfaces an uncaught error during render, even when using `componentDidCatch` as designed or using try/catch around the render. As described in the comment [above the related code](https://github.com/facebook/react/blob/master/packages/shared/invokeGuardedCallbackImpl.js#L32:L49), this is a convenience provided for developers using DevTools for debugging purposes. However, the convenience provided for development debugging is changing behavior in specs, causing failures for otherwise protected code paths, which goes against this statement from the comment description for the code: > But because the error happens in a different event loop context, it does not interrupt the normal program flow. When the error occurs, a spec runner such as Mocha will fail the test with the uncaught error, then continue with the next test. After advancing, the second render of the component will complete and call the ReactDOM.render callback, which continues code from the already-failed test while a subsequent test is in progress. This pollutes the spec suite and leads to other issues that are not produced when using the Production version of React. **If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem. Your bug will get fixed much faster if we can run your code and it doesn't have dependencies other than React. Paste the link to your JSFiddle (https://jsfiddle.net/Luktwrdm/) or CodeSandbox (https://codesandbox.io/s/new) example below:** All relevant code and content has been included in [this CodeSandbox](https://codesandbox.io/s/vvmv7q7o7y). Due to the use of karma/mocha, tests must be run locally. Inline comments add detail to behavior an…