Replace hardcoded strings with MsgType constants (#10604)

* replace hardcoded strings with MsgType constants

* fix import and revert comments

Signed-off-by: Ken Wu kenqiwu@gmail.com

* fix import

Signed-off-by: Ken Wu kenqiwu@gmail.com

---------

Signed-off-by: Ken Wu kenqiwu@gmail.com

src/components/views/messages/EditHistoryMessage.tsx

@@ -17,6 +17,7 @@ limitations under the License.
 import React, { createRef } from "react";
 import { EventStatus, IContent, MatrixEvent, MatrixEventEvent } from "matrix-js-sdk/src/models/event";
 import classNames from "classnames";
+import { MsgType } from "matrix-js-sdk/src/@types/event";
 
 import * as HtmlUtils from "../../../HtmlUtils";
 import { editBodyDiffToHtml } from "../../../utils/MessageDiffUtils";
@@ -166,7 +167,7 @@ export default class EditHistoryMessage extends React.PureComponent<IProps, ISta
                     returnString: false,
                 });
             }
-            if (mxEvent.getContent().msgtype === "m.emote") {
+            if (mxEvent.getContent().msgtype === MsgType.Emote) {
                 const name = mxEvent.sender ? mxEvent.sender.name : mxEvent.getSender();
                 contentContainer = (
                     <div className="mx_EventTile_content" ref={this.content}>