Expand indicator would not be displayed after removal of a collapsed item's child

While setting the hasChildren property of QTreeViewItem, "collapsed" and
"not visible" were being mistaken.

Auto-test included.

Reviewed-by: Olivier
Task-number: QTBUG-7443
(cherry picked from commit 77670c3c0fdc3021356e212e94042a0b5a4f4f8c)

2 files changed, 23 insertions, 4 deletions

diff --git a/src/gui/itemviews/qtreeview.cpp b/src/gui/itemviews/qtreeview.cpp
index 706d2a8..37168eb 100644
--- a/src/gui/itemviews/qtreeview.cpp
+++ b/src/gui/itemviews/qtreeview.cpp
@@ -3770,10 +3770,15 @@ void QTreeViewPrivate::rowsRemoved(const QModelIndex &parent,
         if (previousSibiling != -1 && after && model->rowCount(parent) == start)
             viewItems[previousSibiling].hasMoreSiblings = false;
 
-
-        updateChildCount(parentItem, -removedCount);
-        if (parentItem != -1 && viewItems.at(parentItem).total == 0)
-            viewItems[parentItem].hasChildren = false; //every children have been removed;
+        if (parentItem != -1) {
+            if (viewItems.at(parentItem).expanded) {
+                updateChildCount(parentItem, -removedCount);
+                if (viewItems.at(parentItem).total == 0)
+                    viewItems[parentItem].hasChildren = false; //every children have been removed;
+            } else if (viewItems[parentItem].hasChildren && !hasVisibleChildren(parent)) {
+                viewItems[parentItem].hasChildren = false;
+            }
+        }
         if (after) {
             q->updateGeometries();
             viewport->update();
diff --git a/tests/auto/qtreeview/tst_qtreeview.cpp b/tests/auto/qtreeview/tst_qtreeview.cpp
index fd4815e..e39cf6c 100644
--- a/tests/auto/qtreeview/tst_qtreeview.cpp
+++ b/tests/auto/qtreeview/tst_qtreeview.cpp
@@ -3083,6 +3083,20 @@ void tst_QTreeView::styleOptionViewItem()
         QApplication::processEvents();
         QTRY_VERIFY(delegate.count >= 3);
         QApplication::processEvents();
+
+        item00->setText("OnlyOne");
+        item0->insertRow(2, new QStandardItem("OnlyOne Last"));
+        view.collapse(item0->index());
+        item0->removeRow(0);
+        delegate.count = 0;
+        QTRY_VERIFY(delegate.count >= 2);
+        QApplication::processEvents();
+
+        item0->removeRow(1);
+        item0->setText("OnlyOne");
+        delegate.count = 0;
+        QTRY_VERIFY(delegate.count >= 2);
+        QApplication::processEvents();
     }
 }