magreenblatt wrote:StartDragging is called when you begin a drag event in the browser. That's usually a mouse down followed by a mouse move on a draggable DOM element.
You were right, I messed up SendMouseMoveEvent calls. I had two routines calling it, one in on_touch_move and that was correct, and another one that tracked down mouse cursor and was sending mouse move event without the modifiers=EVENTFLAG_LEFT_MOUSE_BUTTON, and that caused the issue.
Thanks.