Add hack to fix room sidebar not sticking to the top

This is similar to the TimelineView hacks, but this time its the header
item that's changing height as our room topics and such wrap.

(cherry picked from commit 6eb2b2e739)

src/libneochat/qml/GroupChatDrawerHeader.qml

@@ -22,9 +22,9 @@ ColumnLayout {
     /**
      * @brief The canonical alias of the room, if it exists. Otherwise falls back to the first available alias.
      */
-    readonly property var roomAlias: room.aliases[0]
+    readonly property string roomAlias: room?.aliases[0] ?? ""
 
-    Layout.fillWidth: true
+    spacing: 0
 
     RowLayout {
         Layout.fillWidth: true

src/roominfo/DirectChatDrawerHeader.qml

@@ -20,8 +20,6 @@ ColumnLayout {
 
     signal resolveResource(string idOrUri, string action)
 
-    Layout.fillWidth: true
-    Layout.alignment: Qt.AlignVCenter
     spacing: 0
 
     Item {

src/roominfo/RoomInformation.qml

@@ -48,6 +48,10 @@ QQC2.ScrollView {
 
     ListView {
         id: userList
+
+        // Used to determine if the view has settled and should stop perfoming the hack
+        property bool viewHasSettled: false
+
         header: ColumnLayout {
             id: columnLayout
 
@@ -56,15 +60,29 @@ QQC2.ScrollView {
             spacing: 0
             width: ListView.view ? ListView.view.width - ListView.view.leftMargin - ListView.view.rightMargin : 0
 
+            // HACK: Resettle this ListView while our labels wrap themselves. ListView doesn't do this automatically.
+            // We use the Timer to determine when its done internally reshuffling, so we don't accidentally send you to the top if you actually scrolled down.
+            onHeightChanged: {
+                if (!userList.viewHasSettled) {
+                    userList.positionViewAtBeginning();
+                    hackTimer.restart();
+                }
+            }
+
+            Timer {
+                id: hackTimer
+
+                // The internal wrapping and height changes happen quickly, so we don't need a long interval here
+                interval: 1
+                onTriggered: userList.viewHasSettled = true
+            }
+
             Loader {
                 active: true
                 Layout.fillWidth: true
                 Layout.topMargin: Kirigami.Units.smallSpacing
                 visible: !root.room.isSpace
                 sourceComponent: root.room.isDirectChat() ? directChatDrawerHeader : groupChatDrawerHeader
-                onItemChanged: if (item) {
-                    userList.positionViewAtBeginning();
-                }
             }
 
             Kirigami.ListSectionHeader {
@@ -334,5 +352,6 @@ QQC2.ScrollView {
             userList.headerItem.userListSearchField.text = "";
         }
         userList.currentIndex = -1;
+        userList.viewHasSettled = false;
     }
 }