Limit max height of room settings topic area

src/gui/Pages/Chat/RoomPane/SettingsView.qml

@@ -1,11 +1,15 @@
 // SPDX-License-Identifier: LGPL-3.0-or-later
 
 import QtQuick 2.12
+import QtQuick.Controls 2.12
 import QtQuick.Layouts 1.12
 import "../../../Base"
 import "../../../Base/ButtonLayout"
 
 HFlickableColumnPage {
+    id: settingsView
+
+
     property var saveFuture: null
 
     readonly property bool anyChange:
@@ -113,9 +117,14 @@ HFlickableColumnPage {
 
         Layout.fillWidth: true
 
-        HTextArea {
-            // TODO: limit height
+        ScrollView {
+            clip: true
             width: parent.width
+            height:
+                Math.min(topicAreaIn.implicitHeight, settingsView.height / 2)
+
+            HTextArea {
+                id: topicAreaIn
                 placeholderText: qsTr("This room is about...")
                 defaultText: chat.roomInfo.plain_topic
                 enabled: chat.roomInfo.can_set_topic
@@ -126,6 +135,7 @@ HFlickableColumnPage {
                     encryptCheckBox
             }
         }
+    }
 
     HCheckBox {
         id: encryptCheckBox