Merge pull request #19216 from twbs/dropdown-min-width

Extract $dropdown-min-width variable

scss/_dropdown.scss

@@ -42,7 +42,7 @@
   z-index: $zindex-dropdown;
   display: none; // none by default, but block on "open" of the menu
   float: left;
-  min-width: 160px;
+  min-width: $dropdown-min-width;
   padding: 5px 0;
   margin: 2px 0 0; // override default ul
   font-size: $font-size-base;

scss/_variables.scss

@@ -426,6 +426,7 @@ $form-icon-danger: url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www
 //
 // Dropdown menu container and contents.
 
+$dropdown-min-width:             160px !default;
 $dropdown-bg:                    #fff !default;
 $dropdown-border-color:          rgba(0,0,0,.15) !default;
 $dropdown-border-width:          $border-width !default;