scrollbar fixed for main chat and chat drawer (#1301)

gpt4all-chat/main.qml

@@ -675,7 +675,7 @@ Window {
             anchors.top: parent.top
             anchors.bottom: !currentChat.isServer ? textInputView.top : parent.bottom
             anchors.bottomMargin: !currentChat.isServer ? 30 : 0
-            ScrollBar.vertical.policy: ScrollBar.AlwaysOn
+            ScrollBar.vertical.policy: ScrollBar.AlwaysOff
 
             Rectangle {
                 anchors.fill: parent
@@ -729,6 +729,7 @@ Window {
                     visible: ModelList.installedModels.count !== 0
                     anchors.fill: parent
                     model: chatModel
+                    ScrollBar.vertical: ScrollBar { policy: ScrollBar.AlwaysOn }
 
                     Accessible.role: Accessible.List
                     Accessible.name: qsTr("List of prompt/response pairs")

gpt4all-chat/qml/ChatDrawer.qml

@@ -63,15 +63,15 @@ Drawer {
             anchors.top: newChat.bottom
             anchors.bottom: checkForUpdatesButton.top
             anchors.bottomMargin: 10
-            ScrollBar.vertical.policy: ScrollBar.AlwaysOn
+            ScrollBar.vertical.policy: ScrollBar.AlwaysOff
             clip: true
 
             ListView {
                 id: conversationList
                 anchors.fill: parent
                 anchors.rightMargin: 10
-
                 model: ChatListModel
+                ScrollBar.vertical: ScrollBar { policy: ScrollBar.AlwaysOn }
 
                 delegate: Rectangle {
                     id: chatRectangle
@@ -287,4 +287,4 @@ Drawer {
             }
         }
     }
-}
+}