DEV: Refactor composer preview rendering (#31308)

- Switch to use new `<DecoratedHtml` component (including
`renderGlimmer` support)

- Updates click handling to use `{{on` modifier instead of manual event
listener setup/teardown

app/assets/javascripts/discourse/app/components/composer-editor.js

@@ -519,8 +519,12 @@ export default class ComposerEditor extends Component {
     resolveAllShortUrls(ajax, this.siteSettings, preview);
   }
 
-  _decorateCookedElement(preview) {
-    this.appEvents.trigger("decorate-non-stream-cooked-element", preview);
+  _decorateCookedElement(preview, helper) {
+    this.appEvents.trigger(
+      "decorate-non-stream-cooked-element",
+      preview,
+      helper
+    );
   }
 
   @debounce(DEBOUNCE_JIT_MS)
@@ -896,13 +900,13 @@ export default class ComposerEditor extends Component {
   }
 
   @action
-  previewUpdated(preview) {
+  previewUpdated(preview, helper) {
     this._renderMentions(preview);
     this._renderHashtags(preview);
     this._refreshOneboxes(preview);
     this._expandShortUrls(preview);
 
-    this._decorateCookedElement(preview);
+    this._decorateCookedElement(preview, helper);
 
     this.composer.afterRefresh(preview);
   }

app/assets/javascripts/discourse/app/components/composer-messages.js

@@ -2,6 +2,7 @@ import { tracked } from "@glimmer/tracking";
 import Component from "@ember/component";
 import EmberObject, { action } from "@ember/object";
 import { not } from "@ember/object/computed";
+import { schedule } from "@ember/runloop";
 import { service } from "@ember/service";
 import { classNameBindings } from "@ember-decorators/component";
 import { ajax } from "discourse/lib/ajax";
@@ -70,8 +71,10 @@ export default class ComposerMessages extends Component {
       return;
     }
 
-    this.reset();
-    this.popup(EmberObject.create(info));
+    schedule("actions", () => {
+      this.reset();
+      this.popup(EmberObject.create(info));
+    });
   }
 
   // Resets all active messages.

app/assets/javascripts/discourse/app/components/d-editor.hbs

@@ -71,12 +71,16 @@
     </div>
   </div>
 
+  {{! template-lint-disable no-invalid-interactive }}
   <div
     class="d-editor-preview-wrapper {{if this.forcePreview 'force-preview'}}"
+    {{on "click" this.handlePreviewClick}}
   >
-    <div class="d-editor-preview">
-      {{html-safe this.preview}}
-    </div>
+    <DecoratedHtml
+      @className="d-editor-preview"
+      @html={{html-safe this.preview}}
+      @decorate={{this.previewUpdated}}
+    />
     <span class="d-editor-plugin">
       <PluginOutlet
         @name="editor-preview"

app/assets/javascripts/discourse/app/components/d-editor.js

@@ -15,7 +15,7 @@ import InsertHyperlink from "discourse/components/modal/insert-hyperlink";
 import { SKIP } from "discourse/lib/autocomplete";
 import Toolbar from "discourse/lib/composer/toolbar";
 import discourseDebounce from "discourse/lib/debounce";
-import discourseComputed, { bind } from "discourse/lib/decorators";
+import discourseComputed from "discourse/lib/decorators";
 import deprecated from "discourse/lib/deprecated";
 import { isTesting } from "discourse/lib/environment";
 import { getRegister } from "discourse/lib/get-owner";
@@ -60,6 +60,8 @@ export default class DEditor extends Component {
   /** @type {TextManipulation} */
   @tracked textManipulation;
 
+  @tracked preview;
+
   ready = false;
   lastSel = null;
   showLink = true;
@@ -105,14 +107,7 @@ export default class DEditor extends Component {
 
   didInsertElement() {
     super.didInsertElement(...arguments);
-
     this._previewMutationObserver = this._disablePreviewTabIndex();
-
-    // disable clicking on links in the preview
-    this.element
-      .querySelector(".d-editor-preview")
-      .addEventListener("click", this._handlePreviewLinkClick);
-    ``;
   }
 
   get keymap() {
@@ -154,8 +149,12 @@ export default class DEditor extends Component {
     return keymap;
   }
 
-  @bind
-  _handlePreviewLinkClick(event) {
+  @action
+  handlePreviewClick(event) {
+    if (!event.target.closest(".d-editor-preview")) {
+      return;
+    }
+
     if (wantsNewWindow(event)) {
       return;
     }
@@ -184,10 +183,6 @@ export default class DEditor extends Component {
 
   @on("willDestroyElement")
   _shutDown() {
-    this.element
-      .querySelector(".d-editor-preview")
-      ?.removeEventListener("click", this._handlePreviewLinkClick);
-
     this._previewMutationObserver?.disconnect();
 
     this._cachedCookFunction = null;
@@ -235,24 +230,7 @@ export default class DEditor extends Component {
       return;
     }
 
-    this.set("preview", cooked);
-
-    schedule("afterRender", () => {
-      if (
-        this._state !== "inDOM" ||
-        !this.element ||
-        this.isDestroying ||
-        this.isDestroyed
-      ) {
-        return;
-      }
-
-      const previewElement = this.element.querySelector(".d-editor-preview");
-
-      if (previewElement && this.previewUpdated) {
-        this.previewUpdated(previewElement);
-      }
-    });
+    this.preview = cooked;
   }
 
   @observes("ready", "value", "processPreview")
@@ -716,7 +694,7 @@ export default class DEditor extends Component {
       });
     });
 
-    observer.observe(document.querySelector(".d-editor-preview"), {
+    observer.observe(document.querySelector(".d-editor-preview-wrapper"), {
       childList: true,
       subtree: true,
       attributes: false,