Tested in IE 10, IE 11:
When clicking on the scrollbar of the dropdown menu, the dropdown collapses unexpectedly. See the gif:

I'm running into a similar issue elsewhere, so I hope this helps debug it: in IE, clicking a scroll bar will bubble up a click event further up the parent chain. Maybe there's a way to limit the click's reach, but I haven't found one yet.
Same problem in Chrome...
well.. seeing it loading a big array of data...
I'm not seeing this problem in chrome but does anyone have a temporary fix for this issue in IE
Any news on this issue?
Is this bug fixed in Release 2.3.0?
@pascallaliberte It is not an issue of a bubbling event, because input is a self-closing tag. Instead, this is just a slightly annoying behavior from IE which is either by-design or a bug MS does not intend to fix (IIRC). It fires a blur event when clicking the scrollbar, which triggers the blur handler, which implements this.open = false, thus closing the Dropdown.
@eckledes No. I'll try to solve it.
Okay, should be fixed now: #373
@sagalbot
same problem in Chrome in modal window
I'm on v2.5.1 and this keeps happening. In my case, only the first time I try to scroll with native browser UI after doing an ajax search with brings me lot of results. Once closed, if I open the dropdown again then I can scroll using the native browser UI.
Most helpful comment
Any news on this issue?