Some echo tests added.

internal/presentation/typing_echo.go

@@ -50,11 +50,12 @@ func TypingEcho(event atspi.Event, previousText string, options Options) (string
 		return characterEcho, kind
 	}
 	context := event.Source.TextBeforeCaret
-	if context == "" {
-		context = event.Source.Text
-	}
 	if (event.Payload == "\n" || event.Payload == "\t") && strings.TrimSpace(context) == "" {
+		// After splitting a line, Text describes the following line, which
+		// may already contain text. Completion belongs to the prior caret.
 		context = previousText
+	} else if context == "" && !event.Source.TextCaretKnown {
+		context = event.Source.Text
 	}
 	if options.EnableEchoBySentence {
 		if sentence := completedSentence(context, event.Payload); sentence != "" {