src/vs/workbench/services/textfile/common/textFileEditorModel.ts/TextFileEditorModel/setEncoding
class TextFileEditorModel:	setEncoding(encoding: string, mode: EncodingMode): Promise<void> {

		// Remember that an explicit encoding was set
		this.hasEncodingSetExplicitly = true;

		return this.setEncodingInternal(encoding, mode);
	}