Description of problem:

This bugzilla is follow-up to some IRC chat.

Recommend enhancing the fancyqueries dropdown to have to a dynamic placement in the UI.

Today, if the browser is narrow and the dropdown is selected, there is potential for part of the dropdown to be cut off (e.g. search history or favorites that are very long).  This bugzilla is to request making the vertical placement of the dropdown a bit more dynamic.  For example, automatically shift the dropdown to the left, so that it is completely visible.

Version-Release number of selected component (if applicable):
git master

How reproducible:
always

Steps to Reproduce:
1. go to /notices
2. enter a long search string (e.g. '你好你好你好你好你好你好你好你好你好你好你好你好你好你好你好你好你好你好你好你好你好你好你好你好')
3. click the search dropdown
  
Actual results:
part of the dropdown is cutoff

Expected results:
all contents in dropdown are visible 

Additional info: