Fix stickers display text on room summary (#3221)

Signed-off-by: Marco Antonio Alvarez <[email protected]>

Author: surakin

libraries/eventformatter/impl/src/main/kotlin/io/element/android/libraries/eventformatter/impl/DefaultRoomLastMessageFormatter.kt

@@ -85,7 +85,7 @@ class DefaultRoomLastMessageFormatter @Inject constructor(
                 }
             }
             is StickerContent -> {
-                content.body
+                prefixIfNeeded(sp.getString(CommonStrings.common_sticker) + " (" + content.body + ")", senderDisambiguatedDisplayName, isDmRoom)
             }
             is UnableToDecryptContent -> {
                 val message = sp.getString(CommonStrings.common_waiting_for_decryption_key)

libraries/eventformatter/impl/src/test/kotlin/io/element/android/libraries/eventformatter/impl/DefaultRoomLastMessageFormatterTest.kt

@@ -105,11 +105,12 @@ class DefaultRoomLastMessageFormatterTest {
     @Test
     @Config(qualifiers = "en")
     fun `Sticker content`() {
-        val body = "body"
+        val body = "a sticker body"
         val info = ImageInfo(null, null, null, null, null, null, null)
         val message = createRoomEvent(false, null, StickerContent(body, info, aMediaSource(url = "url")))
         val result = formatter.format(message, false)
-        assertThat(result).isEqualTo(body)
+        val expectedBody = someoneElseId.toString() + ": Sticker (a sticker body)"
+        assertThat(result.toString()).isEqualTo(expectedBody)
     }
 
     @Test