blueimp/jQuery-File-Upload — pull request #1102 by mpokrywka (2012-03-17 01:06:33+00:00)
Title: Fix iframe transport to work with older Opera versions

Opera < 9.6 iframe sometimes (always?) triggers premature
onload event right after submit before response was received

This commit should fix it, tested on Opera Linux 9.27 and Opera Linux 9.52