Fix after upgrading the wysiswyg package

src/components/views/rooms/MessageComposer.tsx

@@ -371,7 +371,7 @@ export class MessageComposer extends React.Component<IProps, IState> {
 
         const { isRichTextEnabled, composerContent } = this.state;
         const convertedContent = isRichTextEnabled
-            ? await richToPlain(composerContent)
+            ? await richToPlain(composerContent, false)
             : await plainToRich(composerContent, false);
 
         this.setState({

src/components/views/rooms/wysiwyg_composer/DynamicImportWysiwygComposer.tsx

@@ -45,9 +45,11 @@ export const dynamicImportConversionFunctions = async (): Promise<{
      * ensure that HTML entities are correctly interpreted, and to prevent newline characters being turned into `<br>`.
      *
      * @param rich - html to convert
+     * @param inMessageFormat - `true` to format the return value for use as a message `formatted_body`.
+     * `false` to format it for writing to an editor element.
      * @returns a string of plain text that may contain markdown
      */
-    richToPlain(rich: string): Promise<string>;
+    richToPlain(rich: string, inMessageFormat: boolean): Promise<string>;
 
     /**
      * Creates a rust model from plain text input (interpreted as markdown) and uses it to generate the rich text

src/components/views/rooms/wysiwyg_composer/utils/createMessageContent.ts

@@ -96,7 +96,7 @@ export async function createMessageContent(
 
     // if we're editing rich text, the message content is pure html
     // BUT if we're not, the message content will be plain text where we need to convert the mentions
-    const body = isHTML ? await richToPlain(message) : convertPlainTextToBody(message);
+    const body = isHTML ? await richToPlain(message, false) : convertPlainTextToBody(message);
     const bodyPrefix = (isReplyAndEditing && getTextReplyFallback(editedEvent)) || "";
     const formattedBodyPrefix = (isReplyAndEditing && getHtmlReplyFallback(editedEvent)) || "";