--- a/src/core/strings.cc	Fri Nov 07 18:36:18 2025 -0500
+++ b/src/core/strings.cc	Mon Nov 10 15:51:45 2025 -0500
@@ -301,4 +301,29 @@
 	return Strings::ToUtf8String(QCoreApplication::tr(str));
 }
 
+/* Moved here from glib code because xsettings parser needs it */
+bool IsGTKThemeDark(const std::string_view str)
+{
+	/* if that doesn't exist, use the GTK theme and check for some known
+	 * suffixes. if one is found, return
+	 *
+	 * XXX probably better to use case folding here */
+	static constexpr std::array<std::string_view, 3> suffixes = {
+	    "-dark",   /* Adwaita-dark */
+	    "-Dark",   /* Arc-Dark */
+	    "-Darker", /* Arc-Darker */
+	};
+
+	for (const auto &suffix : suffixes) {
+		if (str.size() < suffix.size())
+			continue;
+
+		if (std::equal(str.data() + str.size() - suffix.length(), str.data() + str.size(), suffix.begin(),
+		               suffix.end()))
+			return true;
+	}
+
+	return false;
+}
+
 } // namespace Strings