Found a few ways in which the Braille problem with browsers could resurface. Fixed now.

internal/atspi/adapter_snapshot_native.go

@@ -10,9 +10,10 @@ package atspi
 import "C"
 
 import (
+	"context"
 	"fmt"
 	"strings"
-	"time"
+	"unicode/utf8"
 )
 
 func nativeError(operation string, nativeError *C.GError) error {
@@ -61,6 +62,7 @@ func snapshotFromNativeWithOptions(source *C.AtspiAccessible, text, caretCharact
 		textContent,
 		C.GoString(captured.caretCharacter),
 	)
+	characterCount := int(captured.characterCount)
 	snapshot.TextCaretKnown = captured.text != nil && captured.textStartOffset >= 0
 	if text && snapshot.Role != "password text" {
 		switch snapshot.Role {
@@ -71,6 +73,12 @@ func snapshotFromNativeWithOptions(source *C.AtspiAccessible, text, caretCharact
 	if snapshot.TextCaretKnown {
 		captureBrailleLine(&snapshot, textContent, C.GoString(captured.textBeforeCaret), int(captured.textStartOffset))
 		if text := C.atspi_accessible_get_text(source); text != nil {
+			// Caret captures omit whole-document metadata. An incomplete
+			// expansion still needs the native count to know whether a name
+			// can safely replace this entire line.
+			if caretCharacter && strings.ContainsRune(textContent, '\ufffc') && characterCount <= 0 {
+				characterCount = int(C.atspi_text_get_character_count(text, nil))
+			}
 			snapshot.TextAttributeRun = native_text_attribute_run(text, snapshot.BrailleCaret)
 			snapshot.Misspelled = TextAttributesMisspelled(snapshot.TextAttributeRun.Values)
 			if len(captureAttributes) != 0 && captureAttributes[0] {
@@ -93,9 +101,12 @@ func snapshotFromNativeWithOptions(source *C.AtspiAccessible, text, caretCharact
 		}
 	}
 	if caretCharacter && captured.editable == 0 && snapshot.Role != "terminal" && strings.ContainsRune(textContent, '\ufffc') {
-		budget := embeddedTextBudget{nodes: 32, characters: maxSnapshotFieldLength, deadline: time.Now().Add(100 * time.Millisecond)}
 		// Hypertext offsets refer to raw characters, before whitespace folding.
-		snapshot.Text = sanitizeSnapshotField(expandNativeEmbeddedText(source, textContent, int(captured.textStartOffset), 0, &budget))
+		start := int(captured.textStartOffset)
+		line := expandNativeDocumentText(context.Background(), source, snapshot, DocumentCaretText{
+			Start: start, End: start + utf8.RuneCountInString(textContent), Text: textContent, CharacterCount: characterCount,
+		})
+		snapshot.Text = sanitizeSnapshotField(line.Text)
 	}
 	snapshot.BusName = sanitizeSnapshotField(C.GoString(captured.busName))
 	if snapshot.Role == "radio button" {
@@ -148,7 +159,7 @@ func snapshotFromNativeWithOptions(source *C.AtspiAccessible, text, caretCharact
 	snapshot.TableColumnHeaders = sanitizeSnapshotField(C.GoString(captured.tableColumnHeaders))
 	C.g_free(C.gpointer(captured.tableRowHeaders))
 	C.g_free(C.gpointer(captured.tableColumnHeaders))
-	snapshot.CharacterCount = int(captured.characterCount)
+	snapshot.CharacterCount = characterCount
 	snapshot.EmbeddedObjectCount = int(captured.embeddedObjectCount)
 	snapshot.XMLRoles = sanitizeSnapshotField(C.GoString(captured.xmlRoles))
 	snapshot.HTMLTag = sanitizeSnapshotField(C.GoString(captured.htmlTag))