fix whitespace with fixed navbar & footer

dist/js/adminlte.js

@@ -379,6 +379,10 @@
           } else {
             $(Selector.CONTENT).css('min-height', max + offset - heights.header);
           }
+
+          if (this._isFooterFixed()) {
+            $(Selector.CONTENT).css('min-height', parseFloat($(Selector.CONTENT).css('min-height')) + heights.footer);
+          }
         }
 
         if ($('body').hasClass(ClassName.LAYOUT_FIXED)) {
@@ -450,6 +454,10 @@
           }
         });
         return max;
+      };
+
+      _proto._isFooterFixed = function _isFooterFixed() {
+        return $('.main-footer').css('position') === 'fixed';
       } // Static
       ;