fixes #9855: account for modal overflow on body hiding scrollbar

dist/css/bootstrap.css

@@ -5593,6 +5593,12 @@ button.close {
   overflow: hidden;
 }
 
+body.modal-open,
+.modal-open .navbar-fixed-top,
+.modal-open .navbar-fixed-bottom {
+  margin-right: 15px;
+}
+
 .modal {
   position: fixed;
   top: 0;

less/modals.less

@@ -10,6 +10,14 @@
 // Kill the scroll on the body
 .modal-open {
   overflow: hidden;
+
+
+  // Account for hiding of scrollbar
+  body&,
+  .navbar-fixed-top,
+  .navbar-fixed-bottom {
+    margin-right: 15px
+  }
 }
 
 // Container that the modal scrolls within