remove drag and drop shims

used only in one place in the codebase

pyqtgraph/Qt.py

@@ -432,10 +432,8 @@ if QT_LIB == PYQT6:
     QtGui.QSinglePointEvent.localPos = lambda o : o.position()
     QtGui.QSinglePointEvent.windowPos = lambda o : o.scenePosition()
     QtGui.QSinglePointEvent.screenPos = lambda o : o.globalPosition()
-    QtGui.QDropEvent.posF = lambda o : o.position()
 
     QtWidgets.QApplication.exec_ = QtWidgets.QApplication.exec
-    QtGui.QDrag.exec_ = lambda o : o.exec()
 
     # PyQt6 6.0.0 has a bug where it can't handle certain Type values returned
     # by the Qt library.

pyqtgraph/dockarea/Dock.py

@@ -198,7 +198,7 @@ class Dock(QtGui.QWidget, DockDrop):
         self.drag.setMimeData(mime)
         self.widgetArea.setStyleSheet(self.dragStyle)
         self.update()
-        action = self.drag.exec_()
+        action = self.drag.exec_() if hasattr(self.drag, 'exec_') else self.drag.exec()
         self.updateStyle()
 
     def float(self):

pyqtgraph/dockarea/DockDrop.py

@@ -30,9 +30,12 @@ class DockDrop(object):
         
     def dragMoveEvent(self, ev):
         #print "drag move"
-        ld = ev.posF().x()
+        # QDragMoveEvent inherits QDropEvent which provides posF()
+        # PyQt6 provides only position()
+        posF = ev.posF() if hasattr(ev, 'posF') else ev.position()
+        ld = posF.x()
         rd = self.width() - ld
-        td = ev.posF().y()
+        td = posF.y()
         bd = self.height() - td
         
         mn = min(ld, rd, td, bd)