Adapt the Lexxy composer to main's link preview hardening

Main strips a javascript: href from a preview node before it's parsed, so
tell legacy Trix attachments apart by their filename instead. escapeHTML
moved to the string helpers, and the unfurling system test now drives
the Lexxy editor.

app/javascript/controllers/unfurl_controller.js

@@ -1,7 +1,6 @@
 import { Controller } from "@hotwired/stimulus"
 import { post } from "@rails/request.js"
-import { truncateString } from "helpers/string_helpers"
-import { escapeHTML } from "helpers/dom_helpers"
+import { escapeHTML, truncateString } from "helpers/string_helpers"
 
 const OPENGRAPH_EMBED_CONTENT_TYPE = "application/vnd.actiontext.opengraph-embed"
 

lib/rails_ext/actiontext_opengraph_embeds.rb

@@ -20,7 +20,7 @@ class ActionText::Attachment::OpengraphEmbed
       # and content-type, so newer attachments carry the details in their
       # content markup instead.
       def attributes_from_node(node)
-        if node["href"].present?
+        if node["filename"].present?
           {
             href: web_url(node["href"]),
             url: web_url(node["url"]),

test/system/unfurling_links_test.rb

@@ -16,29 +16,18 @@ class UnfurlingLinksTest < ApplicationSystemTestCase
   end
 
   test "a quote in the opengraph image URL cannot add attributes to the preview" do
-    paste_into_composer @website.page_url
+    paste_in_composer @website.page_url
 
-    assert_selector "trix-editor .og-embed__title", text: "A normal looking link"
+    assert_selector "#composer lexxy-editor .og-embed__title", text: "A normal looking link"
 
     assert_equal @website.image_url, preview_image_attributes["src"]
     assert_empty preview_image_attributes.keys - %w[ src class alt ]
   end
 
   private
-    def paste_into_composer(url)
-      page.execute_script(<<~JS, url)
-        const editor = document.querySelector("trix-editor")
-        editor.focus()
-
-        const clipboardData = new DataTransfer()
-        clipboardData.setData("text/plain", arguments[0])
-        editor.dispatchEvent(new ClipboardEvent("paste", { clipboardData, bubbles: true, cancelable: true }))
-      JS
-    end
-
     def preview_image_attributes
       page.evaluate_script(<<~JS)
-        Object.fromEntries(Array.from(document.querySelector("trix-editor .og-embed__image img").attributes, attribute => [ attribute.name, attribute.value ]))
+        Object.fromEntries(Array.from(document.querySelector("#composer lexxy-editor .og-embed__image img").attributes, attribute => [ attribute.name, attribute.value ]))
       JS
     end