Switch tiles to using enums and checking format.

src/domain/session/room/timeline/tiles/BaseTextTile.js

@@ -16,12 +16,15 @@ limitations under the License.
 
 import {BaseMessageTile} from "./BaseMessageTile.js";
 import {stringAsBody} from "../MessageBody.js";
+import {createEnum} from "../../../../../utils/enum.js";
+
+export const TextTileFormat = createEnum("Plain", "Html");
 
 export class BaseTextTile extends BaseMessageTile {
     constructor(options) {
         super(options);
         this._messageBody = null;
-        this._messageFormat = null
+        this._format = null
     }
 
     get shape() {
@@ -33,7 +36,7 @@ export class BaseTextTile extends BaseMessageTile {
     }
 
     _getBodyFormat() {
-        return "plain";
+        return TextTileFormat.Plain;
     }
 
     get body() {
@@ -43,13 +46,13 @@ export class BaseTextTile extends BaseMessageTile {
         // doing an equality check
         // Even if the body hasn't changed, but the format has, we need
         // to re-fill our cache.
-        if (!this._messageBody || this._messageBody.sourceString !== body || this._messageFormat !== format) {
+        if (!this._messageBody || this._messageBody.sourceString !== body || this._format !== format) {
             // body with markup is an array of parts,
             // so we should not recreate it for the same body string,
             // or else the equality check in the binding will always fail.
             // So cache it here.
             this._messageBody = this._parseBody(body, format);
-            this._messageFormat = body.format;
+            this._format = body.format;
         }
         return this._messageBody;
     }

src/domain/session/room/timeline/tiles/EncryptedEventTile.js

@@ -42,6 +42,6 @@ export class EncryptedEventTile extends BaseTextTile {
         } else {
             string = decryptionError?.message || this.i18n`Could not decrypt message because of unknown reason.`;
         }
-        return { string, format: "plain" };
+        return string;
     }
 }

src/domain/session/room/timeline/tiles/TextTile.js

@@ -14,17 +14,14 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import {BaseTextTile} from "./BaseTextTile.js";
+import {BaseTextTile, TextTileFormat} from "./BaseTextTile.js";
 import {parsePlainBody} from "../MessageBody.js";
 import {parseHTMLBody} from "../deserialize.js";
 
 export class TextTile extends BaseTextTile {
-    _getContentString(key, fallback = null) {
+    _getContentString(key) {
         const content = this._getContent();
-        let val = content?.[key] || fallback;
-        if (!val && val !== "") { // empty string is falsy, but OK here.
-            return null;
-        }
+        let val = content?.[key] || "";
         if (content.msgtype === "m.emote") {
             val = `* ${this.displayName} ${val}`;
         }
@@ -32,7 +29,7 @@ export class TextTile extends BaseTextTile {
     }
 
     _getPlainBody() {
-        return this._getContentString("body", "");
+        return this._getContentString("body");
     }
 
     _getFormattedBody() {
@@ -40,15 +37,23 @@ export class TextTile extends BaseTextTile {
     }
 
     _getBody() {
-        return this._getFormattedBody() || this._getPlainBody();
+        if (this._getBodyFormat() == TextTileFormat.Html) {
+            return this._getFormattedBody();
+        } else {
+            return this._getPlainBody();
+        }
     }
 
     _getBodyFormat() {
-        return this._getContent()?.["formatted_body"] ? "html" : "plain"
+        if (this._getContent()?.["format"] === "org.matrix.custom.html") {
+            return TextTileFormat.Html;
+        } else {
+            return TextTileFormat.Plain;
+        }
     }
 
     _parseBody(body, format) {
-        if (format === "html") {
+        if (format === TextTileFormat.Html) {
             return parseHTMLBody(this.platform, this._mediaRepository, body);
         } else {
             return parsePlainBody(body);