QTreeView: re-use cached values in rowsInserted()

The parentRowCount and the delta were already calculated
a few lines up, so don't recalculate them here.

This improves performance (rowCount() is a virtual function),
as well as readability (delta is more readable than end -
begin + 1).

Change-Id: Iabe88852a61f7ef52139e1ba446e9d3f87d6bd04
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@theqtcompany.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/widgets/itemviews/qtreeview.cpp b/src/widgets/itemviews/qtreeview.cpp
index e6a6b2a447..135c417f15 100644
--- a/src/widgets/itemviews/qtreeview.cpp
+++ b/src/widgets/itemviews/qtreeview.cpp
@@ -2568,7 +2568,7 @@ void QTreeView::rowsInserted(const QModelIndex &parent, int start, int end)
     if (((parentItem != -1) && d->viewItems.at(parentItem).expanded)
         || (parent == d->root)) {
         d->doDelayedItemsLayout();
-    } else if (parentItem != -1 && (d->model->rowCount(parent) == end - start + 1)) {
+    } else if (parentItem != -1 && parentRowCount == delta) {
         // the parent just went from 0 children to more. update to re-paint the decoration
         d->viewItems[parentItem].hasChildren = true;
         viewport()->update();