support matrix.to links (#1849)

* support room via server params and eventId

* change copy link to matrix.to links

* display matrix.to links in messages as pill and stop generating url previews for them

* improve editor mention to include viaServers and eventId

* fix mention custom attributes

* always try to open room in current space

* jump to latest remove target eventId from url

* add create direct search options to open/create dm with url

src/app/components/editor/output.ts

@@ -51,10 +51,19 @@ const elementToCustomHtml = (node: CustomElement, children: string): string => {
     case BlockType.UnorderedList:
       return `<ul>${children}</ul>`;
 
-    case BlockType.Mention:
-      return `<a href="https://matrix.to/#/${encodeURIComponent(node.id)}">${sanitizeText(
-        node.name
-      )}</a>`;
+    case BlockType.Mention: {
+      let fragment = node.id;
+
+      if (node.eventId) {
+        fragment += `/${node.eventId}`;
+      }
+      if (node.viaServers && node.viaServers.length > 0) {
+        fragment += `?${node.viaServers.map((server) => `via=${server}`).join('&')}`;
+      }
+
+      const matrixTo = `https://matrix.to/#/${fragment}`;
+      return `<a href="${encodeURIComponent(matrixTo)}">${sanitizeText(node.name)}</a>`;
+    }
     case BlockType.Emoticon:
       return node.key.startsWith('mxc://')
         ? `<img data-mx-emoticon src="${node.key}" alt="${sanitizeText(