Scroll the machine list independently of the panel

With a dozen-plus peers the whole panel scrolled, pushing the header, THIS
MACHINE, CONNECTIONS and EXIT NODES off the top to reach the machines. The
list now has its own Flickable, capped at Style.space(260) — about five
rows — so those sections stay in view while the machines move under them.

The cap only applies once it is needed: implicitHeight is
min(content, max), so a tailnet with three machines still renders as a
short panel. The outer scroller stays for when the panel as a whole
outgrows the screen.

scrollItemIntoView() took a single hardcoded scroller, which would have
left j/k in the peers section scrolling the panel rather than the list, and
the highlighted row hidden inside a list that never moved. It now takes the
target scroller, defaulting to the panel; peer navigation scrolls the list
into view first, then the row within it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Panel.qml

@@ -267,24 +267,34 @@ Panel {
     if (region) chooseExitNode(region)
   }
 
-  function scrollItemIntoView(item) {
-    if (!panelFlick || !item) return
+  // `flick` defaults to the whole-panel scroller. The machine list has its own
+  // Flickable, so rows in that section pass it explicitly — scrolling the outer
+  // one to reveal a peer would move the panel rather than the list, and the row
+  // would stay hidden inside a list that never scrolled.
+  function scrollItemIntoView(item, flick) {
+    var view = flick || panelFlick
+    if (!view || !item) return
     Qt.callLater(function() {
       if (!item) return
       var margin = Style.space(6)
-      var point = item.mapToItem(panelFlick.contentItem, 0, 0)
+      var point = item.mapToItem(view.contentItem, 0, 0)
       var top = point.y
       var bottom = top + item.height
-      var viewTop = panelFlick.contentY
-      var viewBottom = viewTop + panelFlick.height
-      var maxY = Math.max(0, panelFlick.contentHeight - panelFlick.height)
-      if (top < viewTop + margin) panelFlick.contentY = Math.max(0, top - margin)
-      else if (bottom > viewBottom - margin) panelFlick.contentY = Math.min(maxY, bottom + margin - panelFlick.height)
+      var viewTop = view.contentY
+      var viewBottom = viewTop + view.height
+      var maxY = Math.max(0, view.contentHeight - view.height)
+      if (top < viewTop + margin) view.contentY = Math.max(0, top - margin)
+      else if (bottom > viewBottom - margin) view.contentY = Math.min(maxY, bottom + margin - view.height)
     })
   }
 
   function scrollCursorIntoView() {
-    if (focusSection === "peers" && peerColumn && peerIndex >= 0 && peerIndex < peerColumn.children.length) scrollItemIntoView(peerColumn.children[peerIndex])
+    if (focusSection === "peers" && peerColumn && peerIndex >= 0 && peerIndex < peerColumn.children.length) {
+      // Bring the machine list itself into view first, then the row within it —
+      // otherwise the row scrolls inside a list that is still off-screen.
+      scrollItemIntoView(peerFlick)
+      scrollItemIntoView(peerColumn.children[peerIndex], peerFlick)
+    }
     else if (focusSection === "exitNodes" && exitNodeColumn && exitNodeIndex >= 0 && exitNodeIndex < exitNodeColumn.children.length) scrollItemIntoView(exitNodeColumn.children[exitNodeIndex])
   }
 
@@ -825,10 +835,31 @@ Panel {
               horizontalAlignment: Text.AlignHCenter
             }
 
-            Column {
-              id: peerColumn
+            // The machine list scrolls on its own rather than pushing the
+            // sections above it off the top of the panel. Its height is the
+            // content height until that passes maxPeerListHeight, after which
+            // it stops growing and scrolls internally — so a tailnet with three
+            // machines still renders as a short panel, and one with thirty
+            // keeps the header, THIS MACHINE, CONNECTIONS and EXIT NODES in
+            // view while the machines move under them.
+            Flickable {
+              id: peerFlick
               visible: root.showPeers
               width: parent.width
+              readonly property real maxPeerListHeight: Style.space(260)
+              implicitHeight: Math.min(peerColumn.implicitHeight, maxPeerListHeight)
+              height: implicitHeight
+              contentWidth: width
+              contentHeight: peerColumn.implicitHeight
+              clip: true
+              boundsBehavior: Flickable.StopAtBounds
+              flickableDirection: Flickable.VerticalFlick
+              interactive: contentHeight > height
+              ScrollBar.vertical: ScrollBar { policy: ScrollBar.AsNeeded }
+
+              Column {
+                id: peerColumn
+                width: peerFlick.width
                 spacing: Style.space(6)
 
                 Repeater {
@@ -847,6 +878,7 @@ Panel {
         }
       }
     }
+  }