More work on LibreOffice support.

internal/atspi/libreoffice_native.go

@@ -120,6 +120,9 @@ func captureLibreOfficeContext(source *C.AtspiAccessible, snapshot *Snapshot) {
 			grandparentRole == C.ATSPI_ROLE_DOCUMENT_SPREADSHEET
 	if context.Cell {
 		context.Coordinates = snapshot.Name
+		// Orca requests uncached attributes: editing can replace a formula
+		// without replacing the accessible cell.
+		C.atspi_accessible_clear_cache_single(source)
 		attributes := C.atspi_accessible_get_attributes(source, nil)
 		if attributes != nil {
 			columnKey, rowKey := C.CString("colindextext"), C.CString("rowindextext")
@@ -130,6 +133,16 @@ func captureLibreOfficeContext(source *C.AtspiAccessible, snapshot *Snapshot) {
 			if column != "" && row != "" {
 				context.Coordinates = sanitizeSnapshotField(column + row)
 			}
+			// Current providers use lowercase; Orca also accepts Formula.
+			for _, key := range []string{"formula", "Formula"} {
+				name := C.CString(key)
+				value := C.g_hash_table_lookup(attributes, C.gconstpointer(name))
+				C.free(unsafe.Pointer(name))
+				if value != nil {
+					context.Formula = sanitizeLibreOfficeFormula(C.GoString((*C.gchar)(value)))
+					break
+				}
+			}
 			C.g_hash_table_unref(attributes)
 		}
 		text := C.atspi_accessible_get_text_iface(source)