Name the channel header avatar for TalkBack

Author: andremion

stream-chat-android-compose/src/main/java/io/getstream/chat/android/compose/ui/messages/header/ChannelHeader.kt

@@ -33,6 +33,8 @@ import androidx.compose.ui.platform.testTag
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.semantics.Role
+import androidx.compose.ui.semantics.contentDescription
+import androidx.compose.ui.semantics.semantics
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
@@ -274,6 +276,7 @@ internal fun DefaultChannelHeaderTrailingContent(
     onClick: ((Channel) -> Unit)?,
     onClickLabel: String? = null,
 ) {
+    val avatarLabel = ChatTheme.channelNameFormatter.formatChannelName(channel, currentUser)
     ChatTheme.componentFactory.ChannelAvatar(
         params = ChannelAvatarParams(
             modifier = Modifier
@@ -284,6 +287,9 @@ internal fun DefaultChannelHeaderTrailingContent(
                         onClickLabel = onClickLabel,
                         role = Role.Button,
                     ) { callback(channel) }
+                        .semantics(mergeDescendants = true) {
+                            contentDescription = avatarLabel
+                        }
                 },
             channel = channel,
             currentUser = currentUser,