[feature] Parse content warning to HTML, serialize via client API as plaintext (#3876)

* [feature] Parse content warning as HTML, serialize via API to plaintext

* tidy up some cruft

* whoops

* oops

* i'm da joker baybee

* clemency muy lorde

* rename some of the text functions for clarity

* jiggle the opts

* fiddle de deee

* hopefully the last test fix i ever have to do in my beautiful life

internal/processing/status/edit.go

@@ -301,7 +301,7 @@ func (p *Processor) Edit(
 	// update the other necessary status fields.
 	status.Content = content.Content
 	status.ContentWarning = content.ContentWarning
-	status.Text = form.Status
+	status.Text = form.Status // raw
 	status.ContentType = contentType
 	status.Language = content.Language
 	status.Sensitive = &form.Sensitive
@@ -309,6 +309,13 @@ func (p *Processor) Edit(
 	status.Attachments = media
 	status.EditedAt = now
 
+	// Only store ContentWarningText if the parsed
+	// result is different from the given SpoilerText,
+	// otherwise skip to avoid duplicating db columns.
+	if content.ContentWarning != form.SpoilerText {
+		status.ContentWarningText = form.SpoilerText
+	}
+
 	if poll != nil {
 		// Set relevent fields for latest with poll.
 		status.ActivityStreamsType = ap.ActivityQuestion