Function shouldApplyLanguage

src/lib/editorManager.js:1355–1365

(file, state, languageSignature)

	}

	function shouldApplyLanguage(file, state, languageSignature) {
		const langExtFn = file?.currentLanguageExtension;
		if (typeof langExtFn !== "function") return false;
		const isPlainText =
			String(file?.currentMode || "").toLowerCase() === "text";
		return (
			file.__cmLanguageSignature !== languageSignature ||
			!file.__cmLanguageReady ||
			(!isPlainText && !hasLanguageSupport(state))
		);
	}

	function markLanguageReady(file, languageSignature, ready) {
		file.__cmLanguageSignature = languageSignature;