PollHistory : simplify so we only have one Node. Also enrich PollHistoryState.

libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/room/PollHistory.kt

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2023 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.element.android.libraries.matrix.ui.room
+
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.DisposableEffect
+import androidx.compose.runtime.remember
+import io.element.android.libraries.matrix.api.room.MatrixRoom
+import io.element.android.libraries.matrix.api.timeline.MatrixTimeline
+
+@Composable
+fun MatrixRoom.rememberPollHistory(): MatrixTimeline {
+    val pollHistory = remember {
+        pollHistory()
+    }
+    DisposableEffect(pollHistory) {
+        onDispose {
+            pollHistory.close()
+        }
+    }
+    return pollHistory
+}