Redirect to first page after changing product_list_limit to value higher than current.

Author: lbajsarowicz

app/code/Magento/Catalog/view/frontend/web/js/product/list/toolbar.js

@@ -80,25 +80,49 @@ define([
             );
         },
 
-        /**
-         * @param {String} paramName
-         * @param {*} paramValue
-         * @param {*} defaultValue
-         */
-        changeUrl: function (paramName, paramValue, defaultValue) {
+        getUrlParams: function() {
             var decode = window.decodeURIComponent,
                 urlPaths = this.options.url.split('?'),
-                baseUrl = urlPaths[0],
                 urlParams = urlPaths[1] ? urlPaths[1].split('&') : [],
-                paramData = {},
-                parameters, i, form, params, key, input, formKey;
+                params = {}, parameters, i;
 
             for (i = 0; i < urlParams.length; i++) {
                 parameters = urlParams[i].split('=');
-                paramData[decode(parameters[0])] = parameters[1] !== undefined ?
+                params[decode(parameters[0])] = parameters[1] !== undefined ?
                     decode(parameters[1].replace(/\+/g, '%20')) :
                     '';
             }
+
+            return params;
+        },
+
+        getCurrentLimit: function()
+        {
+            var currentLimit = this.getUrlParams()[this.options.limit];
+
+            if (currentLimit === undefined) {
+                currentLimit = this.options.limitDefault;
+            }
+
+            return currentLimit;
+        },
+
+
+        /**
+         * @param {String} paramName
+         * @param {*} paramValue
+         * @param {*} defaultValue
+         */
+        changeUrl: function (paramName, paramValue, defaultValue) {
+            var urlPaths = this.options.url.split('?'),
+                baseUrl = urlPaths[0],
+                paramData = this.getUrlParams(),
+                form, params, key, input, formKey;
+
+            if (paramName === this.options.limit && paramValue > this.getCurrentLimit()) {
+                delete paramData['p'];
+            }
+
             paramData[paramName] = paramValue;
 
             if (this.options.post) {
@@ -130,6 +154,7 @@ define([
                 if (paramValue == defaultValue) { //eslint-disable-line eqeqeq
                     delete paramData[paramName];
                 }
+
                 paramData = $.param(paramData);
                 location.href = baseUrl + (paramData.length ? '?' + paramData : '');
             }