Add type hierarchy on `TimelineEvents`.

It is not really OK that a Event was able to invoke `LoadMore` for instance.

features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/TimelineEvents.kt

@@ -22,16 +22,23 @@ sealed interface TimelineEvents {
     data object LoadMore : TimelineEvents
     data class SetHighlightedEvent(val eventId: EventId?) : TimelineEvents
     data class OnScrollFinished(val firstIndex: Int) : TimelineEvents
+
+    // Events coming from a timeline item
+    sealed interface EventFromTimelineItem : TimelineEvents
+
+    // Events coming from a poll item
+    sealed interface TimelineItemPollEvents : EventFromTimelineItem
+
     data class PollAnswerSelected(
         val pollStartId: EventId,
         val answerId: String
-    ) : TimelineEvents
+    ) : TimelineItemPollEvents
 
     data class PollEndClicked(
         val pollStartId: EventId,
-    ) : TimelineEvents
+    ) : TimelineItemPollEvents
 
     data class PollEditClicked(
         val pollStartId: EventId,
-    ) : TimelineEvents
+    ) : TimelineItemPollEvents
 }

features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/components/TimelineItemEventRow.kt

@@ -126,7 +126,7 @@ fun TimelineItemEventRow(
     onMoreReactionsClick: (eventId: TimelineItem.Event) -> Unit,
     onReadReceiptClick: (event: TimelineItem.Event) -> Unit,
     onSwipeToReply: () -> Unit,
-    eventSink: (TimelineEvents) -> Unit,
+    eventSink: (TimelineEvents.EventFromTimelineItem) -> Unit,
     modifier: Modifier = Modifier
 ) {
     val coroutineScope = rememberCoroutineScope()
@@ -267,7 +267,7 @@ private fun TimelineItemEventRowContent(
     onReactionLongClicked: (emoji: String) -> Unit,
     onMoreReactionsClicked: (event: TimelineItem.Event) -> Unit,
     onMentionClicked: (Mention) -> Unit,
-    eventSink: (TimelineEvents) -> Unit,
+    eventSink: (TimelineEvents.EventFromTimelineItem) -> Unit,
     modifier: Modifier = Modifier,
 ) {
     fun ConstrainScope.linkStartOrEnd(event: TimelineItem.Event) = if (event.isMine) {
@@ -412,7 +412,7 @@ private fun MessageEventBubbleContent(
     inReplyToClick: () -> Unit,
     onTimestampClicked: () -> Unit,
     onMentionClicked: (Mention) -> Unit,
-    eventSink: (TimelineEvents) -> Unit,
+    eventSink: (TimelineEvents.EventFromTimelineItem) -> Unit,
     @SuppressLint("ModifierParameter")
     // need to rename this modifier to prevent linter false positives
     @Suppress("ModifierNaming")

features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/components/TimelineItemGroupedEventsRow.kt

@@ -55,7 +55,7 @@ fun TimelineItemGroupedEventsRow(
     onReactionLongClick: (key: String, TimelineItem.Event) -> Unit,
     onMoreReactionsClick: (TimelineItem.Event) -> Unit,
     onReadReceiptClick: (TimelineItem.Event) -> Unit,
-    eventSink: (TimelineEvents) -> Unit,
+    eventSink: (TimelineEvents.EventFromTimelineItem) -> Unit,
     modifier: Modifier = Modifier
 ) {
     val isExpanded = rememberSaveable(key = timelineItem.identifier()) { mutableStateOf(false) }
@@ -104,7 +104,7 @@ private fun TimelineItemGroupedEventsRowContent(
     onReactionLongClick: (key: String, TimelineItem.Event) -> Unit,
     onMoreReactionsClick: (TimelineItem.Event) -> Unit,
     onReadReceiptClick: (TimelineItem.Event) -> Unit,
-    eventSink: (TimelineEvents) -> Unit,
+    eventSink: (TimelineEvents.EventFromTimelineItem) -> Unit,
     modifier: Modifier = Modifier,
 ) {
     Column(modifier = modifier.animateContentSize()) {

features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/components/TimelineItemRow.kt

@@ -43,7 +43,7 @@ internal fun TimelineItemRow(
     onReadReceiptClick: (TimelineItem.Event) -> Unit,
     onTimestampClicked: (TimelineItem.Event) -> Unit,
     onSwipeToReply: (TimelineItem.Event) -> Unit,
-    eventSink: (TimelineEvents) -> Unit,
+    eventSink: (TimelineEvents.EventFromTimelineItem) -> Unit,
     modifier: Modifier = Modifier
 ) {
     when (timelineItem) {

features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/components/TimelineItemStateEventRow.kt

@@ -52,7 +52,7 @@ fun TimelineItemStateEventRow(
     onClick: () -> Unit,
     onLongClick: () -> Unit,
     onReadReceiptsClick: (event: TimelineItem.Event) -> Unit,
-    eventSink: (TimelineEvents) -> Unit,
+    eventSink: (TimelineEvents.EventFromTimelineItem) -> Unit,
     modifier: Modifier = Modifier
 ) {
     val interactionSource = remember { MutableInteractionSource() }

features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/components/event/TimelineItemEventContentView.kt

@@ -43,7 +43,7 @@ import io.element.android.libraries.architecture.Presenter
 fun TimelineItemEventContentView(
     content: TimelineItemEventContent,
     onLinkClicked: (url: String) -> Unit,
-    eventSink: (TimelineEvents) -> Unit,
+    eventSink: (TimelineEvents.EventFromTimelineItem) -> Unit,
     modifier: Modifier = Modifier,
     onContentLayoutChanged: (ContentAvoidingLayoutData) -> Unit = {},
 ) {

features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/components/event/TimelineItemPollView.kt

@@ -31,7 +31,7 @@ import kotlinx.collections.immutable.toImmutableList
 @Composable
 fun TimelineItemPollView(
     content: TimelineItemPollContent,
-    eventSink: (TimelineEvents) -> Unit,
+    eventSink: (TimelineEvents.TimelineItemPollEvents) -> Unit,
     modifier: Modifier = Modifier,
 ) {
     fun onAnswerSelected(pollStartId: EventId, answerId: String) {