More work on LibreOffice support.

internal/presentation/presentation.go

@@ -173,6 +173,9 @@ func FocusSpeechWithOptions(snapshot atspi.Snapshot, options Options) Speech {
 	if reading.SpeakMisspelledIndicator && snapshot.Misspelled {
 		fields = append(fields, "misspelled")
 	}
+	if LibreOfficeCellFormula(snapshot) != "" {
+		fields = append(fields, "has formula")
+	}
 	for _, part := range fields {
 		if part != "" && !contains(parts, part) {
 			parts = append(parts, part)