Terminal: ignore Flatpak's CPR

terminal.go

@@ -256,6 +256,12 @@ func (tw *terminalWriter) processParsedCSI(
 	case final == 'm':
 		// Straight up ignoring all attributes, at least for now.
 		return true
+	case final == 'n':
+		// Report Cursor Position (CPR) cannot be answered, filter it out.
+		// This is because setting FLATPAK_FANCY_OUTPUT=0 spams the terminal.
+		if len(params) == 1 && params[0] == 6 {
+			return true
+		}
 	}
 	return false
 }