rename some of the text functions for clarity

internal/typeutils/internaltofrontend.go

@@ -1376,7 +1376,6 @@ func (c *Converter) baseStatusToFrontend(
 		InReplyToID:        nil, // Set below.
 		InReplyToAccountID: nil, // Set below.
 		Sensitive:          *s.Sensitive,
-		SpoilerText:        text.HTMLToPlain(s.ContentWarning),
 		Visibility:         c.VisToAPIVis(ctx, s.Visibility),
 		LocalOnly:          s.IsLocalOnly(),
 		Language:           nil, // Set below.
@@ -1397,6 +1396,11 @@ func (c *Converter) baseStatusToFrontend(
 		Text:               s.Text,
 		ContentType:        ContentTypeToAPIContentType(s.ContentType),
 		InteractionPolicy:  *apiInteractionPolicy,
+
+		// Mastodon API says spoiler_text should be *text*, not HTML, so
+		// parse any HTML back to plaintext when serializing via the API,
+		// attempting to preserve semantic intent to keep it readable.
+		SpoilerText: text.ParseHTMLToPlain(s.ContentWarning),
 	}
 
 	if at := s.EditedAt; !at.IsZero() {

internal/typeutils/util.go

@@ -383,7 +383,7 @@ func filterableFields(s *gtsmodel.Status) []string {
 	// remove markdown-formatting characters
 	// and ensure more consistent filtering.
 	if s.Content != "" {
-		text := text.HTMLToPlain(s.Content)
+		text := text.ParseHTMLToPlain(s.Content)
 		if text != "" {
 			fields = append(fields, text)
 		}