reducing complexibility and fix sorter

src/bootstrap-table.js

@@ -2392,9 +2392,16 @@
     };
 
     BootstrapTable.prototype.getData = function (useCurrentPage) {
-        return (this.searchText || !$.isEmptyObject(this.filterColumns) || !$.isEmptyObject(this.filterColumnsPartial)) ?
-            (useCurrentPage ? this.data.slice(this.pageFrom - 1, this.pageTo) : this.data) :
-            (useCurrentPage ? this.options.data.slice(this.pageFrom - 1, this.pageTo) : this.options.data);
+        var data = this.options.data;
+        if (this.searchText || this.options.sortName || !$.isEmptyObject(this.filterColumns) || !$.isEmptyObject(this.filterColumnsPartial)) {
+            data = this.data;
+        }
+
+        if (useCurrentPage) {
+            return data.slice(this.pageFrom - 1, this.pageTo);
+        }
+
+        return data;
     };
 
     BootstrapTable.prototype.load = function (data) {