I need to drag’n drop buttons with left mouse button. It does not work with “On Mouse Button Down” by design (issue UE-49100)
I use “On Preview Mouse Button Down”, and drag’n drop with left mouse button worked. However, “On Clicked” or “On pressed” event doesn’t call by single click. Instead of this “On Clicked” event called with double left click.
Also I tried to create custom event for click and call the event with “On Mouse Button Up” event, also have bug - event not always called after quick left click.