Autocomple import ignore rootDirs

**TypeScript Version:** 3.3.3333 If you configure in the tsconfig.json a rootDirs section like ```json { "compilerOptions": { "baseUrl": "src", "rootDirs": [ "src", "src_gen" ] } } ``` When you try autocomplete an import the subjections ignore what is available in the rootDirs, only show the options available in the same folder of the editing file. **Example** File `src/example/example.tsx` ```ts import { exampleImport } from './[autocomplete here]' import { exampleImport2 } from '../[autocomplete here]' ``` Try to autocomplete after `./`, `../`, or any subfolder, the displayed options are only the options available in the src folder, but not the options available in the src_gen folder. **Note:** No matter the folder's order in the rootDirs sections, the result is the same. The value of the baseUrl option is not important for reproduce this behaviour. Maybe related to: https://github.com/Microsoft/TypeScript/issues/28550 and https://github.com/Microsoft/TypeScript/issues/30147