src/vs/workbench/contrib/files/browser/editors/fileEditorInput.ts/FileEditorInput/setPreferredLanguageId
class FileEditorInput:	setPreferredLanguageId(languageId: string): void {
		this.preferredLanguageId = languageId;

		// languages are a good hint to open the file as text
		this.setForceOpenAsText();
	}