fix(multiselect): wrong dropdown height with margin on children in templates

Author: Magdalena Grigorova

styles/web/common/base.less

@@ -901,4 +901,19 @@ input.k-checkbox + label {
     display: inline-block;
     overflow: hidden;
     .disable-high-contrast();
+}
+
+// Header/Footer templates
+.k-list-container {
+
+    .k-footer {
+
+        // ensure right calculating of popup - expanding parent to children with margin
+        &:before,
+        &:after {
+            content: "";
+            display: block;
+            overflow: hidden;
+        }
+    }
 }