QHeaderView: fixes sectionClicked() emitted with wrong section index

The obvious fix is to use the previsously computed 'section' as paramatter.
(It is even faster)

But one might wonder why logicalIndexAt() does not return the same result
before and after flipSortIndicator().  The reason is that while being
sorted, in _q_layoutChanged, all the hidden section where unhidden and hidden
again. Leaving some pending computation.

Task-number: QTBUG-7833
Reviewed-by: Gabriel

2 files changed, 73 insertions, 5 deletions

diff --git a/src/gui/itemviews/qheaderview.cpp b/src/gui/itemviews/qheaderview.cpp
index 8a456e6..1c26e51 100644
--- a/src/gui/itemviews/qheaderview.cpp
+++ b/src/gui/itemviews/qheaderview.cpp
@@ -1853,11 +1853,9 @@ void QHeaderViewPrivate::_q_layoutChanged()
         persistentHiddenSections.clear();
         return;
     }
+
+    QBitArray oldSectionHidden = sectionHidden;
     bool sectionCountChanged = false;
-    for (int i = 0; i < sectionHidden.count(); ++i) {
-        if (sectionHidden.testBit(i))
-            q->setSectionHidden(logicalIndex(i), false);
-    }
 
     for (int i = 0; i < persistentHiddenSections.count(); ++i) {
         QModelIndex index = persistentHiddenSections.at(i);
@@ -1866,6 +1864,7 @@ void QHeaderViewPrivate::_q_layoutChanged()
                                  ? index.column()
                                  : index.row());
             q->setSectionHidden(logical, true);
+            oldSectionHidden.setBit(logical, false);
         } else if (!sectionCountChanged && (modelSectionCount() != sectionCount)) {
             sectionCountChanged = true;
             break;
@@ -1873,6 +1872,11 @@ void QHeaderViewPrivate::_q_layoutChanged()
     }
     persistentHiddenSections.clear();
 
+    for (int i = 0; i < oldSectionHidden.count(); ++i) {
+        if (oldSectionHidden.testBit(i))
+            q->setSectionHidden(logicalIndex(i), false);
+    }
+
     // the number of sections changed; we need to reread the state of the model
     if (sectionCountChanged)
         q->initializeSections();
@@ -2300,7 +2304,7 @@ void QHeaderView::mouseReleaseEvent(QMouseEvent *e)
             int section = logicalIndexAt(pos);
             if (section != -1 && section == d->pressed) {
                 d->flipSortIndicator(section);
-                emit sectionClicked(logicalIndexAt(pos));
+                emit sectionClicked(section);
             }
             if (d->pressed != -1)
                 updateSection(d->pressed);
diff --git a/tests/auto/qheaderview/tst_qheaderview.cpp b/tests/auto/qheaderview/tst_qheaderview.cpp
index 857e7e3..4642830 100644
--- a/tests/auto/qheaderview/tst_qheaderview.cpp
+++ b/tests/auto/qheaderview/tst_qheaderview.cpp
@@ -44,6 +44,7 @@
 #include <QStandardItemModel>
 #include <QStringListModel>
 #include <QSortFilterProxyModel>
+#include <QTableView>
 
 #include <qabstractitemmodel.h>
 #include <qapplication.h>
@@ -190,6 +191,7 @@ private slots:
     void task236450_hidden();
     void task248050_hideRow();
     void QTBUG6058_reset();
+    void QTBUG7833_sectionClicked();
 
 protected:
     QHeaderView *view;
@@ -1992,6 +1994,68 @@ void tst_QHeaderView::QTBUG6058_reset()
     QCOMPARE(checkHeaderViewOrder(&view, QVector<int>() << 2 << 0 << 1 << 3 << 4 << 5 ) , 0);
 }
 
+void tst_QHeaderView::QTBUG7833_sectionClicked()
+{
+
+
+
+
+    QTableView tv;
+    QStandardItemModel *sim = new QStandardItemModel(&tv);
+    QSortFilterProxyModel *proxyModel = new QSortFilterProxyModel(&tv);
+    proxyModel->setSourceModel(sim);
+    proxyModel->setDynamicSortFilter(true);
+    proxyModel->setSortCaseSensitivity(Qt::CaseInsensitive);
+
+    QList<QStandardItem *> row;
+    for (int i = 0; i < 12; i++)
+        row.append(new QStandardItem(QString(QLatin1Char('A' + i))));
+    sim->appendRow(row);
+    row.clear();
+    for (int i = 12; i > 0; i--)
+        row.append(new QStandardItem(QString(QLatin1Char('A' + i))));
+    sim->appendRow(row);
+
+    tv.setSortingEnabled(true);
+    tv.horizontalHeader()->setSortIndicatorShown(true);
+    tv.horizontalHeader()->setClickable(true);
+    tv.horizontalHeader()->setStretchLastSection(true);
+    tv.horizontalHeader()->setResizeMode(QHeaderView::Interactive);
+
+    tv.setModel(proxyModel);
+    tv.setColumnHidden(5, true);
+    tv.setColumnHidden(6, true);
+    tv.horizontalHeader()->swapSections(8, 10);
+    tv.sortByColumn(1, Qt::AscendingOrder);
+
+    QSignalSpy clickedSpy(tv.horizontalHeader(), SIGNAL(sectionClicked(int)));
+    QSignalSpy pressedSpy(tv.horizontalHeader(), SIGNAL(sectionPressed(int)));
+
+
+    QTest::mouseClick(tv.horizontalHeader()->viewport(), Qt::LeftButton, Qt::NoModifier,
+                      QPoint(tv.horizontalHeader()->sectionViewportPosition(11) + 5, 5));
+    QCOMPARE(clickedSpy.count(), 1);
+    QCOMPARE(pressedSpy.count(), 1);
+    QCOMPARE(clickedSpy.at(0).at(0).toInt(), 11);
+    QCOMPARE(pressedSpy.at(0).at(0).toInt(), 11);
+
+    QTest::mouseClick(tv.horizontalHeader()->viewport(), Qt::LeftButton, Qt::NoModifier,
+                      QPoint(tv.horizontalHeader()->sectionViewportPosition(8) + 5, 5));
+
+    QCOMPARE(clickedSpy.count(), 2);
+    QCOMPARE(pressedSpy.count(), 2);
+    QCOMPARE(clickedSpy.at(1).at(0).toInt(), 8);
+    QCOMPARE(pressedSpy.at(1).at(0).toInt(), 8);
+
+    QTest::mouseClick(tv.horizontalHeader()->viewport(), Qt::LeftButton, Qt::NoModifier,
+                      QPoint(tv.horizontalHeader()->sectionViewportPosition(0) + 5, 5));
+
+    QCOMPARE(clickedSpy.count(), 3);
+    QCOMPARE(pressedSpy.count(), 3);
+    QCOMPARE(clickedSpy.at(2).at(0).toInt(), 0);
+    QCOMPARE(pressedSpy.at(2).at(0).toInt(), 0);
+}
+
 
 QTEST_MAIN(tst_QHeaderView)
 #include "tst_qheaderview.moc"