Merge pull request #672 from datou3600/develop

bug fix: keep this._styles._max increasing

src/gridstack.js

@@ -947,14 +947,14 @@
         if (typeof maxHeight == 'undefined') {
             maxHeight = this._styles._max;
         }
+        if (this._styles._max !== 0 && maxHeight <= this._styles._max) { // Keep this._styles._max increasing
+            return ;
+        }
         this._initStyles();
         this._updateContainerHeight();
         if (!this.opts.cellHeight) { // The rest will be handled by CSS
             return ;
         }
-        if (this._styles._max !== 0 && maxHeight <= this._styles._max) {
-            return ;
-        }
 
         if (!this.opts.verticalMargin || this.opts.cellHeightUnit === this.opts.verticalMarginUnit) {
             getHeight = function(nbRows, nbMargins) {