After upgrading to 2019 R2 build 2328 (32 bit) our users noted that dragging within treeviews using the right mouse button no longer is possible.
The treeview controls have the Dragauto property set and DisableDragAndDrop unchecked.
When dragging with the left button, BeginDrag and DragDrop events are triggered as expected, upon inital press/move left button and upon release left button.
When dragging with the right button, BeginRightDrag is triggered as dragging starts, but a DragDrop event is never triggered when the mouse button is released.
I have traced this behaviour in two widely different treeview controls in different dialogs.
We use the two dragging modes for performing different operations, so it would be nice if anyone knows a workaround. Maybe the Dragdrop event may be activated again in the BeginRightDrag event code?