Merge pull request #3391 from matrix-org/bwindels/cider-format-history

New composer: ensure undo history is persisted before applying formatting

src/components/views/rooms/BasicMessageComposer.js

@@ -454,6 +454,7 @@ export default class BasicMessageEditor extends React.Component {
         if (range.length === 0) {
             return;
         }
+        this.historyManager.ensureLastChangesPushed(this.props.model);
         switch (action) {
             case "bold":
                 formatInline(range, "**");