Tests: Fix the "dialog: core: focus tabbable" test in IE #1951
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In IE in jQuery 3.4+ a sequence:
doesn't end up with a focused input. However, in this test we only want to check
that the last focused input receives the focus back when
_focusTabbable()
iscalled which in reality doesn't happen so quickly so let's avoid the issue by
waiting a bit.
Ref jquery/jquery#4856