Merge branch 'ie-dropdown-search-field' into 'master'

Fixed dropdown search field height in ie11

## What does this MR do?

Fixes the height of the search input in dropdown menus.

## What are the relevant issue numbers?

Closes #19684 

## Screenshots (if relevant)

![Screen_Shot_2016-07-11_at_11.49.52](/uploads/fc25bc3d2c3bbd195f30d1953dc12662/Screen_Shot_2016-07-11_at_11.49.52.png)

See merge request !5179

app/assets/stylesheets/framework/dropdowns.scss

@@ -350,6 +350,7 @@
 
 .dropdown-input-field, .default-dropdown-input {
   width: 100%;
+  min-height: 30px;
   padding: 0 7px;
   color: $dropdown-input-color;
   line-height: 30px;