allow escaping the first slash to not write a command

src/editor/serialize.js

@@ -74,3 +74,16 @@ export function stripEmoteCommand(model) {
     model.removeText({index: 0, offset: 0}, 4);
     return model;
 }
+
+export function unescapeMessage(model) {
+    const {parts} = model;
+    if (parts.length) {
+        const firstPart = parts[0];
+        // only unescape \/ to / at start of editor
+        if (firstPart.type === "plain" && firstPart.text.startsWith("\\/")) {
+            model = model.clone();
+            model.removeText({index: 0, offset: 0}, 1);
+        }
+    }
+    return model;
+}