tableview: Remove toggle selection on corner widget click

On Qt 6.7.0 a wrong signal is connected meaning we get an exception
trying to disconnect the selectAll slot (QTBUG-124267). Still even that
fixed the implementation has changed such that it is using explicit
disconnect in the widget's destructor (using explicit stored established
QObject::Connection) so it will fail there. Out of abundance of caution
simply remove the behavior override.

Orange/widgets/data/utils/tableview.py

@@ -62,8 +62,6 @@ def __init__(self, *args, **kwargs):
         self.__cornerButton = btn = self.findChild(QAbstractButton)
         self.__cornerButtonFilter = DataTableView.__CornerPainter(self)
         btn.installEventFilter(self.__cornerButtonFilter)
-        btn.clicked.disconnect(self.selectAll)
-        btn.clicked.connect(self.cornerButtonClicked)
         if sys.platform == "darwin":
             btn.setAttribute(Qt.WA_MacSmallSize)
 
@@ -86,21 +84,6 @@ def cornerText(self):
         """Return the corner text."""
         return self.__cornerText
 
-    def cornerButtonClicked(self):
-        model = self.model()
-        selection = self.selectionModel()
-        selection = selection.selection()
-        if len(selection) == 1:
-            srange = selection[0]
-            if srange.top() == 0 and srange.left() == 0 \
-                    and srange.right() == model.columnCount() - 1 \
-                    and srange.bottom() == model.rowCount() - 1:
-                self.clearSelection()
-            else:
-                self.selectAll()
-        else:
-            self.selectAll()
-
 
 def source_model(model: QAbstractItemModel) -> Optional[QAbstractItemModel]:
     while isinstance(model, QAbstractProxyModel):

Orange/widgets/data/utils/tests/test_tableview.py

@@ -44,17 +44,6 @@ def test_tableview_empty_model(self):
                                  RichTableModel.Icon)
         view.grab()
 
-    def test_tableview_toggle_select_all(self):
-        view = RichTableView()
-        model = RichTableModel(self.data)
-        view.setModel(model)
-        b = view.findChild(QAbstractButton)
-        b.click()
-        self.assertEqual(len(view.selectionModel().selectedRows(0)),
-                         model.rowCount())
-        b.click()
-        self.assertEqual(len(view.selectionModel().selectedRows(0)), 0)
-
     def test_selection(self):
         view = RichTableView()
         model = RichTableModel(self.data)