feat: safe decodeURIComponent

react/features/base/conference/functions.js

     participantLeft
 } from '../participants';
 import { toState } from '../redux';
+import { safeDecodeURIComponent } from '../util';
 
 import {
     AVATAR_ID_COMMAND,
         || subject
         || callDisplayName
         || (callee && callee.name)
-        || _.startCase(decodeURIComponent(room));
+        || _.startCase(safeDecodeURIComponent(room));
 }
 
 /**

react/features/base/util/uri.js

     return str;
 }
 
+/**
+ * Sometimes we receive strings that we don't know if already percent-encoded, or not, due to the
+ * various sources we get URLs or room names. This function encapsulates the decoding in a safe way.
+ *
+ * @param {string} text - The text to decode.
+ * @returns {string}
+ */
+export function safeDecodeURIComponent(text: string) {
+    try {
+        return decodeURIComponent(text);
+    } catch (e) {
+        // The text wasn't encoded.
+    }
+
+    return text;
+}
+
 /**
  * Attempts to return a {@code String} representation of a specific
  * {@code Object} which is supposed to represent a URL. Obviously, if a

react/features/recent-list/functions.native.js

     getLocalizedDurationFormatter
 } from '../base/i18n';
 import { NavigateSectionList } from '../base/react';
-import { parseURIString } from '../base/util';
+import { parseURIString, safeDecodeURIComponent } from '../base/util';
 
 /**
  * Creates a displayable list item of a recent list entry.
             _toDurationString(item.duration),
             serverName
         ],
-        title: decodeURIComponent(location.room),
+        title: safeDecodeURIComponent(location.room),
         url: item.conference
     };
 }