cc: fix band expansion of footer items

port 2.0

(cherry picked from commit 2609b49846)

quickshell/Modules/ControlCenter/Components/CcDetailBand.qml

@@ -31,17 +31,21 @@ FocusScope {
 
     property string shownSection: ""
     readonly property var pageItem: pageLoader.item
+    readonly property bool pluginPage: shownSection.startsWith("plugin_") || shownSection.startsWith("builtin_")
+    // A page measures itself a tick after it loads; waiting for that keeps the first target the final one.
     readonly property real pageHeight: {
         const own = pageItem?.implicitHeight ?? 0;
         if (own > 0)
             return own;
+        if (!pluginPage)
+            return 0;
         const preferred = pageItem?.preferredHeight ?? 0;
         return preferred > 0 ? preferred : CcMetrics.detailHeightDefault;
     }
     // The band's extent includes the gap above and below its card, so they grow and shrink with it.
     readonly property real chromeHeight: CcMetrics.gridGap * 2 + CcMetrics.detailHeaderHeight + CcMetrics.detailDialogPadding * 2
     readonly property real contentCap: Math.max(CcMetrics.detailHeightFloor(shownSection, pageItem?.preferredHeight ?? 0), maximumHeight - chromeHeight)
-    readonly property real targetHeight: section === "" ? 0 : chromeHeight + Math.min(pageHeight, contentCap)
+    readonly property real targetHeight: section === "" || pageHeight <= 0 ? 0 : chromeHeight + Math.min(pageHeight, contentCap)
     readonly property bool transitioning: heightAnimation.running
     // Only IPC can ask for a plugin section whose tile is not placed, so there is nothing to show.
     readonly property bool pageEmpty: pageItem?.empty === true

quickshell/Modules/ControlCenter/ControlCenterContent.qml

@@ -47,8 +47,10 @@ FocusScope {
     readonly property real dragRoom: widgetGrid.dragging && (host.growsFromTop ?? true) && widgetGrid.pinnedHeight + newRowUnit <= availableGridHeight ? newRowUnit : 0
     readonly property real newRowUnit: CcMetrics.gridGap + widgetGrid.slotLayout.rowUnit
     // Held during a drag so the trash never moves under the pointer.
-    readonly property real heldGridHeight: widgetGrid.dragging ? widgetGrid.pinnedHeight + dragRoom : gridTargetHeight
-    readonly property real targetImplicitHeight: CcMetrics.sheetPadding * 2 + heldGridHeight
+    readonly property real heldGridHeight: widgetGrid.dragging ? widgetGrid.pinnedHeight + dragRoom : gridHeight
+    // The popout sizes to where the band is going; the content inside follows the band frame by frame.
+    readonly property real targetImplicitHeight: CcMetrics.sheetPadding * 2 + (widgetGrid.dragging ? heldGridHeight : gridTargetHeight)
+    readonly property bool contentOverflows: targetImplicitHeight > (host.availableHeight ?? Infinity)
     property Item detailReturnFocus: null
     property var pageHistory: []
     // One string so Discard and undo can compare and restore the whole session state at once.
@@ -128,9 +130,9 @@ FocusScope {
         host.collapseAll();
     }
 
-    // Followed while the band grows, so it stays in view however the popout and the grid settle around it.
+    // Only a popout the screen has capped scrolls; otherwise it grows around the band and any scroll would bounce.
     function revealDetail() {
-        if (detailBand.section === "")
+        if (detailBand.section === "" || !contentOverflows)
             return;
         const top = mainColumn.y + body.y + detailBand.y;
         contentFlickable.revealRange(top, top + detailBand.height);