[Common] wrong button's layout in Firefox for mac on hdpi display

apps/common/main/lib/component/Button.js

@@ -160,8 +160,8 @@ define([
                 '</span>' +
             '</button>' +
             '<button type="button" class="btn <%= cls %> inner-box-caption dropdown-toggle" data-toggle="dropdown">' +
-                '<span class="caption"><%= caption %></span>' +
                 '<span class="btn-fixflex-vcenter">' +
+                    '<span class="caption"><%= caption %></span>' +
                     '<i class="caret img-commonctrl"></i>' +
                 '</span>' +
             '</button>' +

apps/common/main/resources/less/buttons.less

@@ -155,6 +155,9 @@
     }
 
     .btn-fixflex-vcenter {
+        display: flex;
+        align-items: center;
+
         .caret {
             vertical-align: inherit;
         }