Improve chat scrolling and minimap bounds

gui/ChatPane.qml

@@ -5,15 +5,23 @@ import QtQuick.Layouts 1.15
 Item {
     id: chatPane
     property bool sidebarVisible: true
+    property int maxVisibleBlocks: 80
     signal toggleSidebar()
     function scrollToBottom() {
         chatView.positionViewAtEnd()
     }
+    function trimVisibleBlocks() {
+        if (chatModel.count > chatPane.maxVisibleBlocks)
+            chatModel.trimFront(chatPane.maxVisibleBlocks)
+    }
     function loadChat() {
         chatModel.reset()
         if (ollie.activeSessionId && ollie.activeAgentId) {
             var log = ollie.readLogForSession(ollie.activeSessionId, ollie.activeAgentId)
-            if (log) { chatModel.appendData(log); chatModel.trimFront(20) }
+            if (log) {
+                chatModel.appendData(log)
+                chatModel.trimFront(chatPane.maxVisibleBlocks)
+            }
         }
         scrollToBottom()
     }
@@ -124,6 +132,13 @@ Item {
                     anchors.margins: 4
                     visible: ollie.daemonConnected && ollie.activeAgentId !== ""
 
+                    onCountChanged: {
+                        if (!scrollButton.visible) chatPane.scrollToBottom()
+                    }
+                    onContentHeightChanged: {
+                        if (!scrollButton.visible) chatPane.scrollToBottom()
+                    }
+
                     delegate: ChatBlockDelegate {
                         width: chatView.width - 8
                     }
@@ -167,7 +182,8 @@ Item {
                     }
                 }
                 Button {
-                    anchors.right: parent.right
+                    id: scrollButton
+                    anchors.horizontalCenter: parent.horizontalCenter
                     anchors.bottom: parent.bottom
                     anchors.margins: 12
                     text: "↓"
@@ -272,6 +288,11 @@ Item {
         }
 
 
+Connections {
+    target: chatModel
+    function onCountChanged() { chatPane.trimVisibleBlocks() }
+}
+
 Connections {
     target: ollie
     function onSessionsChanged() { chatPane.loadChat() }