Can you provide more reproduction steps? When we try to reproduce this, the dropdown does go away.
Event handlers on search button are prevented by app
Could be a bug or totally intended, it's more a warning than an actual bug report.
.off()in app.js on this line
Is preventing to bind any events on the search button.
I needed it for my theme and had to remove the .off to make it work.
What is the function of this one in that case and why removing all the handled events ? Is there a down part in removing that ?