Add target=blank to links in formatted text via js

app/javascript/controllers/rich_text_link_targets_controller.js

@@ -0,0 +1,12 @@
+import { Controller } from "@hotwired/stimulus"
+
+// Connects to data-controller="rich-text-link-targets"
+export default class extends Controller {
+  connect() {
+    this.element.querySelectorAll('div.trix-content a').forEach(function(link) {
+      if (link.host !== window.location.host) {
+        link.target = "_blank"
+      }
+    })
+  }
+}