diff --git a/.github/stale.yml b/.github/stale.yml
new file mode 100644
index 00000000..c9108884
--- /dev/null
+++ b/.github/stale.yml
@@ -0,0 +1,19 @@
+# Number of days of inactivity before an issue becomes stale
+daysUntilStale: 60
+# Number of days of inactivity before a stale issue is closed
+daysUntilClose: 7
+# Issues with these labels will never be considered stale
+exemptLabels:
+  - bug
+  - enhancement
+  - pinned
+  - security
+# Label to use when marking an issue as stale
+staleLabel: wontfix
+# Comment to post when marking an issue as stale. Set to `false` to disable
+markComment: >
+  This issue has been automatically marked as stale because it has not had
+  recent activity. It will be closed if no further activity occurs. Thank you
+  for your contributions.
+# Comment to post when closing a stale issue. Set to `false` to disable
+closeComment: false
\ No newline at end of file
diff --git a/CHANGE.md b/CHANGE.md
index e22d3cf5..80468877 100755
--- a/CHANGE.md
+++ b/CHANGE.md
@@ -3,9 +3,12 @@ Change Log: `yii2-grid`
 
 ## Version 3.3.1
 
-**Date:** 15-May-2019
+**Date:** 17-May-2019
 
+- Implement stale bot.
+- (enh #902): Ability to merge columns at page summary (via `pageSummaryOptions['colspan']` set at column level).
 - (enh #901): Update Latvian Translations.
+- (enh #896): Enhance generation of pjax container identifier.
 - (bug #889): Correct nested expand row validation.
 - (enh #888): Enhance `BooleanColumn` data rendering for grid export.
 - (bug #885, #886): Fix for `CheckboxColumn::checkboxOptions` to be set as Closure.
diff --git a/src/ColumnTrait.php b/src/ColumnTrait.php
index 3ad4e0a1..81b7e43c 100644
--- a/src/ColumnTrait.php
+++ b/src/ColumnTrait.php
@@ -563,7 +563,7 @@ protected function initPjax($script = '')
         if (!$this->grid->pjax || empty($script)) {
             return;
         }
-        $cont = 'jQuery("#' . $this->grid->pjaxSettings['options']['id'] . '")';
+        $cont = 'jQuery("#' . $this->grid->getPjaxContainerId() . '")';
         $view = $this->grid->getView();
         $ev = 'pjax:complete.' . hash('crc32', $script);
         $view->registerJs("{$cont}.off('{$ev}').on('{$ev}', function(){ {$script} });");
diff --git a/src/DataColumn.php b/src/DataColumn.php
index 6ee10e2c..f8ed2d01 100644
--- a/src/DataColumn.php
+++ b/src/DataColumn.php
@@ -264,7 +264,7 @@ protected function renderFilterCellContent()
         ];
         if (is_array($this->filter)) {
             if (Config::isInputWidget($this->filterType) && $this->grid->pjax) {
-                $options['pjaxContainerId'] = $this->grid->pjaxSettings['options']['id'];
+                $options['pjaxContainerId'] = $this->grid->getPjaxContainerId();
             }
             if ($this->filterType === GridView::FILTER_SELECT2 || $this->filterType === GridView::FILTER_TYPEAHEAD) {
                 $options['data'] = $this->filter;
diff --git a/src/EditableColumn.php b/src/EditableColumn.php
index be9378b6..b1b30c76 100644
--- a/src/EditableColumn.php
+++ b/src/EditableColumn.php
@@ -119,7 +119,7 @@ public function renderDataCellContent($model, $key, $index)
         Html::addCssClass($options, $this->_css);
         $this->_editableOptions['containerOptions'] = $options;
         if ($this->grid->pjax && empty($this->_editableOptions['pjaxContainerId'])) {
-            $this->_editableOptions['pjaxContainerId'] = $this->grid->pjaxSettings['options']['id'];
+            $this->_editableOptions['pjaxContainerId'] = $this->grid->getPjaxContainerId();
         }
         if (!isset($key)) {
             throw new InvalidConfigException('Invalid or no primary key found for the grid data.');
diff --git a/src/GridView.php b/src/GridView.php
index 5448645e..bd783841 100644
--- a/src/GridView.php
+++ b/src/GridView.php
@@ -1092,12 +1092,7 @@ public function init()
         }
         $this->initBsVersion();
         Html::addCssClass($this->options, 'is-bs' . ($this->isBs4() ? '4' : '3'));
-        if (empty($this->options['id'])) {
-            $this->options['id'] = $this->getId();
-        }
-        if (empty($this->pjaxSettings['options']['id'])) {
-            $this->pjaxSettings['options']['id'] = $this->options['id'] . '-pjax';
-        }
+        $this->initPjaxContainerId();
         if (!isset($this->itemLabelSingle)) {
             $this->itemLabelSingle = Yii::t('kvgrid', 'item');
         }
@@ -1141,6 +1136,29 @@ public function init()
         parent::init();
     }
 
+    /**
+     * Get pjax container identifier
+     * @return string
+     */
+    public function getPjaxContainerId()
+    {
+        $this->initPjaxContainerId();
+        return $this->pjaxSettings['options']['id'];
+    }
+
+    /**
+     * Initializes pjax container identifier
+     */
+    public function initPjaxContainerId()
+    {
+        if (empty($this->options['id'])) {
+            $this->options['id'] = $this->getId();
+        }
+        if (empty($this->pjaxSettings['options']['id'])) {
+            $this->pjaxSettings['options']['id'] = $this->options['id'] . '-pjax';
+        }
+    }
+
     /**
      * Adds CSS class to the pager parameter
      * @param string $param the pager param
@@ -1202,9 +1220,30 @@ public function renderPageSummary()
             $this->pageSummaryRowOptions['class'] = ($this->isBs4() ? 'table-' : '') . 'warning kv-page-summary';
         }
         $cells = [];
-        /** @var DataColumn $column */
-        foreach ($this->columns as $column) {
+        $skipped = [];
+        $cols = count($this->columns);
+        for ($i = 0; $i < $cols; $i++) {
+            /** @var DataColumn $column */
+            $column = $this->columns[$i];
+            if (!method_exists($column, 'renderPageSummaryCell')) {
+                $cells[] = Html::tag('td');
+                continue;
+            }
             $cells[] = $column->renderPageSummaryCell();
+            if (!empty($column->pageSummaryOptions['colspan'])) {
+                $span = (int) $column->pageSummaryOptions['colspan'];
+                if ($span > 0) {
+                    $skipCols = range($i + 1, $i + $span - 1);
+                    $skipped = array_merge($skipCols, $skipped);
+                }
+            }
+        }
+        if (!empty($skipped )) {
+            for ($i = 0; $i < $cols; $i++) {
+                if (in_array($i, $skipped )) {
+                    $cells[$i] = '';
+                }
+            }
         }
         $tag = ArrayHelper::remove($this->pageSummaryContainer, 'tag', 'tbody');
         $content = Html::tag('tr', implode('', $cells), $this->pageSummaryRowOptions);
diff --git a/src/assets/js/jquery.floatThead.js b/src/assets/js/jquery.floatThead.js
index b57a0f53..d214e8df 100644
--- a/src/assets/js/jquery.floatThead.js
+++ b/src/assets/js/jquery.floatThead.js
@@ -1,4 +1,4 @@
-/** @preserve jQuery.floatThead 2.1.1 - http://mkoryak.github.io/floatThead/ - Copyright (c) 2012 - 2018 Misha Koryak **/
+/** @preserve jQuery.floatThead 2.1.3 - https://mkoryak.github.io/floatThead/ - Copyright (c) 2012 - 2018 Misha Koryak **/
 // @license MIT
 
 /* @author Misha Koryak
@@ -7,7 +7,7 @@
  * Dependencies:
  * jquery 1.9.0 + [required] OR jquery 1.7.0 + jquery UI core
  *
- * http://mkoryak.github.io/floatThead/
+ * https://mkoryak.github.io/floatThead/
  *
  * Tested on FF13+, Chrome 21+, IE8, IE9, IE10, IE11
  */
@@ -141,11 +141,11 @@
     var _afterPrint = window.onafterprint;
     window.onbeforeprint = function () {
       _beforePrint && _beforePrint();
-      $window.triggerHandler("beforeprint");
+      $window.triggerHandler("fth-beforeprint");
     };
     window.onafterprint = function () {
       _afterPrint && _afterPrint();
-      $window.triggerHandler("afterprint");
+      $window.triggerHandler("fth-afterprint");
     };
   }
 
@@ -213,7 +213,7 @@
   }
 
   /**
-   * Check if a given table has been datatableized (http://datatables.net)
+   * Check if a given table has been datatableized (https://datatables.net)
    * @param $table
    * @return {Boolean}
    */
@@ -501,14 +501,14 @@
       function setFloatWidth(){
         var tw = tableWidth($table, $fthCells, true);
         var $container = responsive ? $responsiveContainer : $scrollContainer;
-        var width = $container.width() || tw;
+        var width = $container.length ? getOffsetWidth($container[0]) : tw;
         var floatContainerWidth = $container.css("overflow-y") != 'hidden' ? width - scrollbarOffset.vertical : width;
         $floatContainer.width(floatContainerWidth);
         if(locked){
           var percent = 100 * tw / (floatContainerWidth);
           $floatTable.css('width', percent+'%');
         } else {
-          $floatTable.outerWidth(tw);
+          $floatTable.css('width', tw+'px');
         }
       }
 
@@ -780,6 +780,9 @@
               var gap = tableContainerGap - scrollingContainerTop + tableTopGap;
               top = gap > 0 ? gap : 0;
               triggerFloatEvent(false);
+            } else if(scrollingContainerTop - tableContainerGap > tableHeight - floatContainerHeight){
+              // scrolled past table but there is space in the container under it..
+              top = tableHeight - floatContainerHeight - scrollingContainerTop - tableContainerGap;
             } else {
               top = wrappedContainer ? tableTopGap : scrollingContainerTop;
               //headers stop at the top of the viewport
@@ -788,7 +791,7 @@
             left = tableLeftGap;
           } else if(!locked && useAbsolutePositioning) { //window scrolling, absolute positioning
             if(windowTop > floatEnd + tableHeight + captionScrollOffset){
-              top = tableHeight - floatContainerHeight + captionScrollOffset; //scrolled past table
+              top = tableHeight - floatContainerHeight + captionScrollOffset + scrollingBottom; //scrolled past table
             } else if (tableOffset.top >= windowTop + scrollingTop) {
               top = 0; //scrolling to table
               unfloat();
@@ -847,15 +850,16 @@
               });
             } else {
               var transform = 'translateX(' + pos.left + 'px) translateY(' + pos.top + 'px)';
-              $floatContainer.css({
+              var cssObj = {
                 '-webkit-transform' : transform,
                 '-moz-transform'    : transform,
                 '-ms-transform'     : transform,
                 '-o-transform'      : transform,
                 'transform'         : transform,
                 'top': 0,
-                'left': 0
-              });
+              };
+              cssObj[/rtl/i.test(document.documentElement.dir || '') ? 'right': 'left'] = 0;
+              $floatContainer.css(cssObj);
             }
             oldTop = pos.top;
             oldLeft = pos.left;
@@ -974,8 +978,8 @@
         matchMediaPrint = window.matchMedia("print");
         matchMediaPrint.addListener(printEvent);
       } else {
-        $window.on('beforeprint', beforePrint);
-        $window.on('afterprint', afterPrint);
+        $window.on('fth-beforeprint', beforePrint);
+        $window.on('fth-afterprint', afterPrint);
       }
       ////// end printing stuff
 
@@ -1072,6 +1076,7 @@
           $floatContainer.remove();
           $table.data('floatThead-attached', false);
           $window.off(ns);
+          $window.off('fth-beforeprint fth-afterprint'); // Not bound with id, so cant use ns.
           if (matchMediaPrint) {
             matchMediaPrint.removeListener(printEvent);
           }
@@ -1108,4 +1113,4 @@
     $ = require('jquery');
   }
   return $;
-})());
+})());
\ No newline at end of file
diff --git a/src/assets/js/jquery.floatThead.min.js b/src/assets/js/jquery.floatThead.min.js
index 7926e7fa..68dbadea 100644
--- a/src/assets/js/jquery.floatThead.min.js
+++ b/src/assets/js/jquery.floatThead.min.js
@@ -1,2 +1,2 @@
-/** @preserve jQuery.floatThead 2.1.1 - http://mkoryak.github.io/floatThead/ - Copyright (c) 2012 - 2018 Misha Koryak **/
-!function(t){t.floatThead=t.floatThead||{},t.floatThead.defaults={headerCellSelector:"tr:visible:first>*:visible",zIndex:1001,position:"auto",top:0,bottom:0,scrollContainer:function(e){return t([])},responsiveContainer:function(e){return t([])},getSizingRow:function(t,e,o){return t.find("tbody tr:visible:first>*:visible")},floatTableClass:"floatThead-table",floatWrapperClass:"floatThead-wrapper",floatContainerClass:"floatThead-container",copyTableClass:!0,autoReflow:!1,debug:!1,support:{bootstrap:!0,datatables:!0,jqueryUI:!0,perfectScrollbar:!0},floatContainerCss:{"overflow-x":"hidden"}};var e=function(){var e={},o=Object.prototype.hasOwnProperty;e.has=function(t,e){return o.call(t,e)},e.keys=Object.keys||function(t){if(t!==Object(t))throw new TypeError("Invalid object");var o=[];for(var n in t)e.has(t,n)&&o.push(n);return o};var n=0;return e.uniqueId=function(t){var e=++n+"";return t?t+e:e},t.each(["Arguments","Function","String","Number","Date","RegExp"],function(){var t=this;e["is"+t]=function(e){return Object.prototype.toString.call(e)=="[object "+t+"]"}}),e.debounce=function(t,e,o){var n,r,a,i,l;return function(){a=this,r=arguments,i=new Date;var s=function(){var d=new Date-i;d<e?n=setTimeout(s,e-d):(n=null,o||(l=t.apply(a,r)))},d=o&&!n;return n||(n=setTimeout(s,e)),d&&(l=t.apply(a,r)),l}},e}(),o="undefined"!=typeof MutationObserver,n=function(){for(var t=3,e=document.createElement("b"),o=e.all||[];t=1+t,e.innerHTML="\x3c!--[if gt IE "+t+"]><i><![endif]--\x3e",o[0];);return 4<t?t:document.documentMode}(),r=/Gecko\//.test(navigator.userAgent),a=/WebKit\//.test(navigator.userAgent);n||r||a||(n=11);var i=function(){if(a){var e=t("<div>").css("width",0).append(t("<table>").css("max-width","100%").append(t("<tr>").append(t("<th>").append(t("<div>").css("min-width",100).text("X")))));t("body").append(e);var o=0==e.find("table").width();return e.remove(),o}return!1},l=!r&&!n,s=t(window),d=r&&window.matchMedia;if(!window.matchMedia||d){var f=window.onbeforeprint,c=window.onafterprint;window.onbeforeprint=function(){f&&f(),s.triggerHandler("beforeprint")},window.onafterprint=function(){c&&c(),s.triggerHandler("afterprint")}}function u(e){var o=e[0].parentElement;do{if("visible"!=window.getComputedStyle(o).getPropertyValue("overflow"))break}while(o=o.parentElement);return o==document.body?t([]):t(o)}function p(t){window&&window.console&&window.console.error&&window.console.error("jQuery.floatThead: "+t)}function h(t){var e=t.getBoundingClientRect();return e.width||e.right-e.left}function v(){var t=document.createElement("scrolltester");t.style.cssText="width:100px;height:100px;overflow:scroll!important;position:absolute;top:-9999px;display:block",document.body.appendChild(t);var e=t.offsetWidth-t.clientWidth;return document.body.removeChild(t),e}function b(t,e,o){var n=o?"outerWidth":"width";if(i&&t.css("max-width")){var r=0;o&&(r+=parseInt(t.css("borderLeft"),10),r+=parseInt(t.css("borderRight"),10));for(var a=0;a<e.length;a++)r+=h(e.get(a));return r}return t[n]()}t.fn.floatThead=function(r){if(r=r||{},n<8)return this;var f=null;if(e.isFunction(i)&&(i=i()),e.isString(r)){var c=r,w=Array.prototype.slice.call(arguments,1),g=this;return this.filter("table").each(function(){var o=t(this),n=o.data("floatThead-lazy");n&&o.floatThead(n);var r=o.data("floatThead-attached");if(r&&e.isFunction(r[c])){var a=r[c].apply(this,w);void 0!==a&&(g=a)}}),g}var m=t.extend({},t.floatThead.defaults||{},r);if(t.each(r,function(o,n){o in t.floatThead.defaults||!m.debug||p("Used ["+o+"] key to init plugin, but that param is not an option for the plugin. Valid options are: "+e.keys(t.floatThead.defaults).join(", "))}),m.debug){var y=t.fn.jquery.split(".");1==parseInt(y[0],10)&&parseInt(y[1],10)<=7&&p("jQuery version "+t.fn.jquery+" detected! This plugin supports 1.8 or better, or 1.7.x with jQuery UI 1.8.24 -> http://jqueryui.com/resources/download/jquery-ui-1.8.24.zip")}return this.filter(":not(."+m.floatTableClass+")").each(function(){var r=e.uniqueId(),i=t(this);if(i.data("floatThead-attached"))return!0;if(!i.is("table"))throw new Error('jQuery.floatThead must be run on a table element. ex: $("table").floatThead();');o=m.autoReflow&&o;var c=i.children("thead:first"),w=i.children("tbody:first");if(0==c.length||0==w.length)return m.debug&&(0==c.length?p("The thead element is missing."):p("The tbody element is missing.")),i.data("floatThead-lazy",m),void i.unbind("reflow").one("reflow",function(){i.floatThead(m)});i.data("floatThead-lazy")&&i.unbind("reflow"),i.data("floatThead-lazy",!1);var g,y,T=!0,C={vertical:0,horizontal:0};e.isFunction(v)&&(v=v());var x=0;!0===m.scrollContainer&&(m.scrollContainer=u);var j=m.scrollContainer(i)||t([]),S=j.length>0,z=S?t([]):m.responsiveContainer(i)||t([]),I=ct(),L=null;"auto"===m.position?L=null:"fixed"===m.position?L=!1:"absolute"===m.position?L=!0:m.debug&&p('Invalid value given to "position" option, valid is "fixed", "absolute" and "auto". You passed: ',m.position),null==L&&(L=S);var W=i.find("caption"),H=1==W.length;if(H)var q="top"===(W.css("caption-side")||W.attr("align")||"top");var R=t("<fthfoot>").css({display:"table-footer-group","border-spacing":0,height:0,"border-collapse":"collapse",visibility:"hidden"}),M=!1,k=t([]),E=n<=9&&!S&&L,D=t("<table/>"),F=t("<colgroup/>"),O=i.children("colgroup:first"),N=!0;0==O.length&&(O=t("<colgroup/>"),N=!1);var A=t("<fthtr>").css({display:"table-row","border-spacing":0,height:0,"border-collapse":"collapse"}),Q=t("<div>").css(m.floatContainerCss).attr("aria-hidden","true"),U=!1,G=t("<thead/>"),P=t('<tr class="size-row" aria-hidden="true"/>'),V=t([]),X=t([]),Y=t([]),B=t([]);G.append(P),i.prepend(O),l&&(R.append(A),i.append(R)),D.append(F),Q.append(D),m.copyTableClass&&D.attr("class",i.attr("class")),D.attr({cellpadding:i.attr("cellpadding"),cellspacing:i.attr("cellspacing"),border:i.attr("border")});var K=i.css("display");if(D.css({borderCollapse:i.css("borderCollapse"),border:i.css("border"),display:K}),S||D.css("width","auto"),"none"===K&&(U=!0),D.addClass(m.floatTableClass).css({margin:0,"border-bottom-width":0}),L){var $=function(e,o){var n=e.css("position"),r=e;if(!("relative"==n||"absolute"==n)||o){var a={paddingLeft:e.css("paddingLeft"),paddingRight:e.css("paddingRight")};Q.css(a),r=e.data("floatThead-containerWrap")||e.wrap(t("<div>").addClass(m.floatWrapperClass).css({position:"relative",clear:"both"})).parent(),e.data("floatThead-containerWrap",r),M=!0}return r};S?(k=$(j,!0)).prepend(Q):(k=$(i),i.before(Q))}else i.before(Q);Q.css({position:L?"absolute":"fixed",marginTop:0,top:L?0:"auto",zIndex:m.zIndex,willChange:"transform"}),Q.addClass(m.floatContainerClass),nt();var J={"table-layout":"fixed"},Z={"table-layout":i.css("tableLayout")||"auto"},_=i[0].style.width||"",tt=i.css("minWidth")||"";function et(t){return t+".fth-"+r+".floatTHead"}function ot(){var e=0;if(c.children("tr:visible").each(function(){e+=t(this).outerHeight(!0)}),"collapse"==i.css("border-collapse")){var o=parseInt(i.css("border-top-width"),10);o>parseInt(i.find("thead tr:first").find(">*:first").css("border-top-width"),10)&&(e-=o/2)}P.outerHeight(e),V.outerHeight(e)}function nt(){g=(e.isFunction(m.top)?m.top(i):m.top)||0,y=(e.isFunction(m.bottom)?m.bottom(i):m.bottom)||0}function rt(){if(!T){if(T=!0,L){var t=b(i,B,!0);t>k.width()&&i.css("minWidth",t)}i.css(J),D.css(J),D.append(c),w.before(G),ot()}}function at(){T&&(T=!1,L&&i.width(_),G.detach(),i.prepend(c),i.css(Z),D.css(Z),i.css("minWidth",tt),i.css("minWidth",b(i,B)))}var it=!1;function lt(t){it!=t&&(it=t,i.triggerHandler("floatThead",[t,Q]))}function st(t){L!=t&&(L=t,Q.css({position:L?"absolute":"fixed"}))}function dt(){var e,o=function(){var e,o=c.find(m.headerCellSelector);if(N?e=O.find("col").length:(e=0,o.each(function(){e+=parseInt(t(this).attr("colspan")||1,10)})),e!==x){x=e;for(var 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