From c33c54be7d07cf9470205f867fbf98a32dfe8ef7 Mon Sep 17 00:00:00 2001
From: Peter Penz <peter.penz19@gmail.com>
Date: Mon, 26 Dec 2011 22:28:54 +0100
Subject: [PATCH] Improve item offset scrolling

Don't check whether the m_layoutTimer is active: Changing the
item offset must always trigger a synchronous layout, otherwise
the smooth-scrolling might get jerky.
---
 src/kitemviews/kitemlistview.cpp | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/src/kitemviews/kitemlistview.cpp b/src/kitemviews/kitemlistview.cpp
index be03606ce..5dbc128b5 100644
--- a/src/kitemviews/kitemlistview.cpp
+++ b/src/kitemviews/kitemlistview.cpp
@@ -201,13 +201,19 @@ qreal KItemListView::maximumScrollOffset() const
 
 void KItemListView::setItemOffset(qreal offset)
 {
+    if (m_layouter->itemOffset() == offset) {
+        return;
+    }
+
     m_layouter->setItemOffset(offset);
     if (m_header) {
         m_header->setPos(-offset, 0);
     }
-    if (!m_layoutTimer->isActive()) {
-        doLayout(NoAnimation);
-    }
+
+    // Don't check whether the m_layoutTimer is active: Changing the
+    // item offset must always trigger a synchronous layout, otherwise
+    // the smooth-scrolling might get jerky.
+    doLayout(NoAnimation);
 }
 
 qreal KItemListView::itemOffset() const
-- 
2.47.3