deepin.dde-shell: fix error with qt 6.8 (#350852)

pkgs/desktops/deepin/core/dde-shell/default.nix

@@ -33,6 +33,7 @@ stdenv.mkDerivation (finalAttrs: {
 
   patches = [
     ./fix-path-for-nixos.diff
+    ./fix-dock-can-not-show-with-qt6_8.diff
   ];
 
   postPatch = ''

pkgs/desktops/deepin/core/dde-shell/fix-dock-can-not-show-with-qt6_8.diff

@@ -0,0 +1,20 @@
+diff --git a/panels/dock/OverflowContainer.qml b/panels/dock/OverflowContainer.qml
+index 74ca966..312f2a0 100644
+--- a/panels/dock/OverflowContainer.qml
++++ b/panels/dock/OverflowContainer.qml
+@@ -52,13 +52,13 @@ Item {
+         for (let child of listView.contentItem.visibleChildren) {
+             width = calculateImplicitWidth(width, child.implicitWidth)
+         }
+-        return width
++        return Math.max(width, 1)
+     }
+     implicitHeight: {
+         let height = 0
+         for (let child of listView.contentItem.visibleChildren) {
+             height = calculateImplicitHeight(height, child.implicitHeight)
+         }
+-        return height
++        return Math.max(height, 1)
+     }
+ }