From 0a4c669e8a43cd9572ec1619e9545faefede03ce Mon Sep 17 00:00:00 2001
From: Devin Lin <espidev@gmail.com>
Date: Sun, 13 Nov 2022 22:17:48 -0500
Subject: [PATCH] homescreens/halcyon: Improve gridview scrolling performance

---
 .../halcyon/package/contents/ui/GridAppDelegate.qml      | 3 +--
 .../halcyon/package/contents/ui/GridAppList.qml          | 9 ++++++---
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/containments/homescreens/halcyon/package/contents/ui/GridAppDelegate.qml b/containments/homescreens/halcyon/package/contents/ui/GridAppDelegate.qml
index c06e2ecb..63329d19 100644
--- a/containments/homescreens/halcyon/package/contents/ui/GridAppDelegate.qml
+++ b/containments/homescreens/halcyon/package/contents/ui/GridAppDelegate.qml
@@ -127,8 +127,7 @@ MouseArea {
         }
         spacing: 0
 
-        // Use Kirigami.Icon to have better icon dimension options
-        Kirigami.Icon {
+        PlasmaCore.IconItem {
             id: icon
 
             Kirigami.Theme.inherit: false
diff --git a/containments/homescreens/halcyon/package/contents/ui/GridAppList.qml b/containments/homescreens/halcyon/package/contents/ui/GridAppList.qml
index 6c1f2b11..0bf8efbd 100644
--- a/containments/homescreens/halcyon/package/contents/ui/GridAppList.qml
+++ b/containments/homescreens/halcyon/package/contents/ui/GridAppList.qml
@@ -19,16 +19,19 @@ import org.kde.phone.homescreen.halcyon 1.0 as Halcyon
 
 MobileShell.GridView {
     id: gridView
-    layer.enabled: true
+    cacheBuffer: cellHeight * 20 // 10 rows above and below
     reuseItems: true
     
+    // ensure items aren't visible out of bounds
+    layer.enabled: true
+    
     readonly property int reservedSpaceForLabel: metrics.height
     readonly property real effectiveContentWidth: width - leftMargin - rightMargin
     
-    cellWidth: gridView.effectiveContentWidth / Math.min(Math.floor(gridView.effectiveContentWidth / (PlasmaCore.Units.iconSizes.huge + Kirigami.Units.largeSpacing * 2)), 8)
+    cellWidth: gridView.effectiveContentWidth / Math.min(Math.floor(effectiveContentWidth / (PlasmaCore.Units.iconSizes.huge + Kirigami.Units.largeSpacing * 2)), 8)
     cellHeight: cellWidth + reservedSpaceForLabel
 
-    property int columns: Math.floor(gridView.effectiveContentWidth / cellWidth)
+    property int columns: Math.floor(effectiveContentWidth / cellWidth)
     property int rows: Math.ceil(Halcyon.ApplicationListModel.count / columns)
 
     function goToBeginning() {