widgets: Use QList::reserve(), reduces reallocations.

Change-Id: I49cc03f365c77f142f62c8e77505ec09723a44d9
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/widgets/widgets/qabstractscrollarea.cpp b/src/widgets/widgets/qabstractscrollarea.cpp
index 5e45c66f3b..65d06eafc5 100644
--- a/src/widgets/widgets/qabstractscrollarea.cpp
+++ b/src/widgets/widgets/qabstractscrollarea.cpp
@@ -210,10 +210,12 @@ QWidgetList QAbstractScrollAreaScrollBarContainer::widgets(LogicalPosition posit
     QWidgetList list;
     const int scrollBarIndex = scrollBarLayoutIndex();
     if (position == LogicalLeft) {
+        list.reserve(scrollBarIndex);
         for (int i = 0; i < scrollBarIndex; ++i)
             list.append(layout->itemAt(i)->widget());
     } else if (position == LogicalRight) {
         const int layoutItemCount = layout->count();
+        list.reserve(layoutItemCount - (scrollBarIndex + 1));
         for (int i = scrollBarIndex + 1; i < layoutItemCount; ++i)
             list.append(layout->itemAt(i)->widget());
     }