Add QModelIndex::siblingAtColumn and ::siblingAtRow

Data in item models is most often organized in rows, where each column
contains an attribute of the item represented by the row. Often when
sibling is used, it is to request another piece of data from the same
row. Having a specialized version makes this easier and less awkward
to do, simplifying

auto sibling = index.sibling(index.row(), columnOfInterest);

to

auto sibling = index.siblingAtColumn(columnOfInterest);

For symmetry reasons, siblingAtRow(rowOfInterest) was also added.

Change-Id: Ib203b2cdb16154cbb2680d16fb5c6a7538f33d07
Reviewed-by: Topi Reiniö <topi.reinio@qt.io>
Reviewed-by: David Faure <david.faure@kdab.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/tests/auto/corelib/itemmodels/qabstractproxymodel/tst_qabstractproxymodel.cpp b/tests/auto/corelib/itemmodels/qabstractproxymodel/tst_qabstractproxymodel.cpp
index 6c870737da..886941bff6 100644
--- a/tests/auto/corelib/itemmodels/qabstractproxymodel/tst_qabstractproxymodel.cpp
+++ b/tests/auto/corelib/itemmodels/qabstractproxymodel/tst_qabstractproxymodel.cpp
@@ -477,8 +477,8 @@ void tst_QAbstractProxyModel::testSwappingRowsProxy()
     for (int row = 0; row < defaultModel.rowCount(); ++row) {
         QModelIndex left = proxy.index(row, 0, QModelIndex());
         QModelIndex right = proxy.index(row, 1, QModelIndex());
-        QCOMPARE(left.sibling(left.row(), 1), right);
-        QCOMPARE(right.sibling(right.row(), 0), left);
+        QCOMPARE(left.siblingAtColumn(1), right);
+        QCOMPARE(right.siblingAtColumn(0), left);
     }
 }