#1996 #1992 issue with calc interpolation in dropdown LESS

src/definitions/modules/dropdown.less

@@ -400,7 +400,7 @@ select.ui.dropdown {
 /* Scrollbar in IE */
 @media all and (-ms-high-contrast:none) {
   .ui.selection.dropdown .menu {
-    min-width: calc(100% - @scrollBarWidth);
+    min-width: ~"calc(100% - "@scrollBarWidth~")";
   }
 }
 
@@ -430,7 +430,7 @@ select.ui.dropdown {
   border-top: @selectionItemDivider;
   padding-left: @selectionHorizontalPadding !important;
   /* Add in spacing for scroll bar */
-  padding-right: calc(@selectionHorizontalPadding + 1em) !important;
+  padding-right: ~"calc("@selectionHorizontalPadding~" + 1em) !important~";
   white-space: normal;
   word-wrap: normal;
 }