diff --git a/src/Resources/contao/drivers/DC_Folder.php b/src/Resources/contao/drivers/DC_Folder.php
index 1dd58c25a3..a6886948fb 100644
--- a/src/Resources/contao/drivers/DC_Folder.php
+++ b/src/Resources/contao/drivers/DC_Folder.php
@@ -444,6 +444,14 @@ public function showAll()
 		$icon = $GLOBALS['TL_DCA'][$this->strTable]['list']['sorting']['icon'] ?: 'filemounts.svg';
 		$label = Image::getHtml($icon) . ' <label>' . $label . '</label>';
 
+		// Pass previously selected values to picker (#1816)
+		$prevPickerValue = '';
+
+		if ($this->strPickerFieldType)
+		{
+			$prevPickerValue = ' data-picker-value="' . htmlspecialchars(json_encode(array_map('strval', $this->arrPickerValue))) . '"';
+		}
+
 		// Build the tree
 		$return = $this->panel() . Message::generate() . '
 <div id="tl_buttons">' . ((Input::get('act') == 'select') ? '
@@ -459,7 +467,7 @@ public function showAll()
 <div id="paste_hint" data-add-to-scroll-offset="20">
   <p>' . $GLOBALS['TL_LANG']['MSC']['selectNewPosition'] . '</p>
 </div>' : '') . '
-<div class="tl_listing_container tree_view" id="tl_listing">' . ($GLOBALS['TL_DCA'][$this->strTable]['list']['sorting']['breadcrumb'] ?? '') . ((Input::get('act') == 'select' || $this->strPickerFieldType == 'checkbox') ? '
+<div class="tl_listing_container tree_view" id="tl_listing"' . $prevPickerValue . '>' . ($GLOBALS['TL_DCA'][$this->strTable]['list']['sorting']['breadcrumb'] ?? '') . ((Input::get('act') == 'select' || $this->strPickerFieldType == 'checkbox') ? '
 <div class="tl_select_trigger">
 <label for="tl_select_trigger" class="tl_select_label">' . $GLOBALS['TL_LANG']['MSC']['selectAll'] . '</label> <input type="checkbox" id="tl_select_trigger" onclick="Backend.toggleCheckboxes(this)" class="tl_tree_checkbox">
 </div>' : '') . '
diff --git a/src/Resources/contao/drivers/DC_Table.php b/src/Resources/contao/drivers/DC_Table.php
index 2fe521c983..645a7e86fe 100644
--- a/src/Resources/contao/drivers/DC_Table.php
+++ b/src/Resources/contao/drivers/DC_Table.php
@@ -3643,6 +3643,14 @@ protected function treeView()
 <p class="tl_empty">' . $GLOBALS['TL_LANG']['MSC']['noResult'] . '</p>';
 		}
 
+		// Pass previously selected values to picker (#1816)
+		$prevPickerValue = '';
+
+		if ($this->strPickerFieldType)
+		{
+			$prevPickerValue = ' data-picker-value="' . htmlspecialchars(json_encode(array_map('strval', $this->arrPickerValue))) . '"';
+		}
+
 		$return .= ((Input::get('act') == 'select') ? '
 <form id="tl_select" class="tl_form' . ((Input::get('act') == 'select') ? ' unselectable' : '') . '" method="post" novalidate>
 <div class="tl_formbody_edit">
@@ -3651,7 +3659,7 @@ protected function treeView()
 <div id="paste_hint" data-add-to-scroll-offset="20">
   <p>' . $GLOBALS['TL_LANG']['MSC']['selectNewPosition'] . '</p>
 </div>' : '') . '
-<div class="tl_listing_container tree_view" id="tl_listing">' . $breadcrumb . ((Input::get('act') == 'select' || ($this->strPickerFieldType == 'checkbox')) ? '
+<div class="tl_listing_container tree_view" id="tl_listing"' . $prevPickerValue . '>' . $breadcrumb . ((Input::get('act') == 'select' || ($this->strPickerFieldType == 'checkbox')) ? '
 <div class="tl_select_trigger">
 <label for="tl_select_trigger" class="tl_select_label">' . $GLOBALS['TL_LANG']['MSC']['selectAll'] . '</label> <input type="checkbox" id="tl_select_trigger" onclick="Backend.toggleCheckboxes(this)" class="tl_tree_checkbox">
 </div>' : '') . '
@@ -4194,6 +4202,14 @@ protected function parentView()
 			return $return;
 		}
 
+		// Pass previously selected values to picker (#1816)
+		$prevPickerValue = '';
+
+		if ($this->strPickerFieldType)
+		{
+			$prevPickerValue = ' data-picker-value="' . htmlspecialchars(json_encode(array_map('strval', $this->arrPickerValue))) . '"';
+		}
+
 		$return .= ((Input::get('act') == 'select') ? '
 
 <form id="tl_select" class="tl_form' . ((Input::get('act') == 'select') ? ' unselectable' : '') . '" method="post" novalidate>
@@ -4203,7 +4219,7 @@ protected function parentView()
 <div id="paste_hint" data-add-to-scroll-offset="20">
   <p>' . $GLOBALS['TL_LANG']['MSC']['selectNewPosition'] . '</p>
 </div>' : '') . '
-<div class="tl_listing_container parent_view' . ($this->strPickerFieldType ? ' picker unselectable' : '') . '" id="tl_listing">
+<div class="tl_listing_container parent_view' . ($this->strPickerFieldType ? ' picker unselectable' : '') . '" id="tl_listing"' . $prevPickerValue . '>
 <div class="tl_header click2edit toggle_select hover-div">';
 
 		// List all records of the child table
@@ -4824,12 +4840,20 @@ protected function listView()
 		{
 			$result = $objRow->fetchAllAssoc();
 
+			// Pass previously selected values to picker (#1816)
+			$prevPickerValue = '';
+
+			if ($this->strPickerFieldType)
+			{
+				$prevPickerValue = ' data-picker-value="' . htmlspecialchars(json_encode(array_map('strval', $this->arrPickerValue))) . '"';
+			}
+
 			$return .= ((Input::get('act') == 'select') ? '
 <form id="tl_select" class="tl_form' . ((Input::get('act') == 'select') ? ' unselectable' : '') . '" method="post" novalidate>
 <div class="tl_formbody_edit">
 <input type="hidden" name="FORM_SUBMIT" value="tl_select">
 <input type="hidden" name="REQUEST_TOKEN" value="' . REQUEST_TOKEN . '">' : '') . '
-<div class="tl_listing_container list_view" id="tl_listing">' . ((Input::get('act') == 'select' || $this->strPickerFieldType == 'checkbox') ? '
+<div class="tl_listing_container list_view" id="tl_listing"' . $prevPickerValue . '>' . ((Input::get('act') == 'select' || $this->strPickerFieldType == 'checkbox') ? '
 <div class="tl_select_trigger">
 <label for="tl_select_trigger" class="tl_select_label">' . $GLOBALS['TL_LANG']['MSC']['selectAll'] . '</label> <input type="checkbox" id="tl_select_trigger" onclick="Backend.toggleCheckboxes(this)" class="tl_tree_checkbox">
 </div>' : '') . '
diff --git a/src/Resources/contao/library/Contao/Config.php b/src/Resources/contao/library/Contao/Config.php
index 5cc00777b6..9f6cd92301 100644
--- a/src/Resources/contao/library/Contao/Config.php
+++ b/src/Resources/contao/library/Contao/Config.php
@@ -10,6 +10,9 @@
 
 namespace Contao;
 
+use Symfony\Component\Filesystem\Filesystem;
+use Webmozart\PathUtil\Path;
+
 /**
  * Loads and writes the local configuration file
  *
@@ -251,37 +254,47 @@ public function save()
 			$strFile .= "\n" . $this->strBottom . "\n";
 		}
 
-		$strTemp = md5(uniqid(mt_rand(), true));
+		$strTemp = Path::join($this->strRootDir, 'system/tmp', md5(uniqid(mt_rand(), true)));
 
 		// Write to a temp file first
-		$objFile = fopen($this->strRootDir . '/system/tmp/' . $strTemp, 'w');
+		$objFile = fopen($strTemp, 'w');
 		fwrite($objFile, $strFile);
 		fclose($objFile);
 
 		// Make sure the file has been written (see #4483)
-		if (!filesize($this->strRootDir . '/system/tmp/' . $strTemp))
+		if (!filesize($strTemp))
 		{
-			System::log('The local configuration file could not be written. Have your reached your quota limit?', __METHOD__, TL_ERROR);
+			System::log('The local configuration file could not be written. Have you reached your quota limit?', __METHOD__, TL_ERROR);
 
 			return;
 		}
 
+		$fs = new Filesystem();
+
 		// Adjust the file permissions (see #8178)
-		$this->Files->chmod('system/tmp/' . $strTemp, 0666 & ~umask());
+		$fs->chmod($strTemp, 0666 & ~umask());
+
+		$strDestination = Path::join($this->strRootDir, 'system/config/localconfig.php');
+
+		// Get the realpath in case it is a symlink (see #2209)
+		if ($realpath = realpath($strDestination))
+		{
+			$strDestination = $realpath;
+		}
 
 		// Then move the file to its final destination
-		$this->Files->rename('system/tmp/' . $strTemp, 'system/config/localconfig.php');
+		$fs->rename($strTemp, $strDestination, true);
 
 		// Reset the Zend OPcache
 		if (\function_exists('opcache_invalidate'))
 		{
-			opcache_invalidate($this->strRootDir . '/system/config/localconfig.php', true);
+			opcache_invalidate($strDestination, true);
 		}
 
 		// Recompile the APC file (thanks to Trenker)
 		if (\function_exists('apc_compile_file') && !ini_get('apc.stat'))
 		{
-			apc_compile_file($this->strRootDir . '/system/config/localconfig.php');
+			apc_compile_file($strDestination);
 		}
 
 		$this->blnIsModified = false;
diff --git a/src/Resources/public/core.js b/src/Resources/public/core.js
index 3fdf7d1df5..56916530ab 100644
--- a/src/Resources/public/core.js
+++ b/src/Resources/public/core.js
@@ -926,16 +926,29 @@ var Backend =
 				return;
 			}
 			var frm = window.frames['simple-modal-iframe'],
-				val = [], ul, inp, field, act, it, i;
+				val = [], ul, inp, field, act, it, i, pickerValue, sIndex;
 			if (frm === undefined) {
 				alert('Could not find the SimpleModal frame');
 				return;
 			}
 			ul = frm.document.getElementById(opt.id);
+			// Load the previous values (#1816)
+			if (pickerValue = ul.get('data-picker-value')) {
+				val = JSON.parse(pickerValue);
+			}
 			inp = ul.getElementsByTagName('input');
 			for (i=0; i<inp.length; i++) {
-				if (inp[i].checked && !inp[i].id.match(/^(check_all_|reset_)/)) {
-					val.push(inp[i].get('value'));
+				if (inp[i].id.match(/^(check_all_|reset_)/)) {
+					continue;
+				}
+				// Add currently selected value, otherwise remove (#1816)
+				sIndex = val.indexOf(inp[i].get('value'));
+				if (inp[i].checked) {
+					if (sIndex == -1) {
+						val.push(inp[i].get('value'));
+					}
+				} else if (sIndex != -1) {
+					val.splice(sIndex, 1);
 				}
 			}
 			if (opt.callback) {
diff --git a/src/Resources/public/core.min.js b/src/Resources/public/core.min.js
index 78a8fb8092..cd74bf2e6d 100644
--- a/src/Resources/public/core.min.js
+++ b/src/Resources/public/core.min.js
@@ -1 +1 @@
-var AjaxRequest={themePath:Contao.script_url+"system/themes/"+Contao.theme+"/",toggleNavigation:function(e,t,n){e.blur();var a=$(t),o=$(e).getParent("li");return a&&(o.hasClass("collapsed")?(o.removeClass("collapsed"),$(e).store("tip:title",Contao.lang.collapse),new Request.Contao({url:n}).post({action:"toggleNavigation",id:t,state:1,REQUEST_TOKEN:Contao.request_token})):(o.addClass("collapsed"),$(e).store("tip:title",Contao.lang.expand),new Request.Contao({url:n}).post({action:"toggleNavigation",id:t,state:0,REQUEST_TOKEN:Contao.request_token}))),!1},toggleStructure:function(i,l,s,r){i.blur();var e=$(l),c=$(i).getFirst("img");return e?"none"==e.getStyle("display")?(e.setStyle("display",null),c.src=AjaxRequest.themePath+"icons/folMinus.svg",$(i).store("tip:title",Contao.lang.collapse),new Request.Contao({field:i}).post({action:"toggleStructure",id:l,state:1,REQUEST_TOKEN:Contao.request_token})):(e.setStyle("display","none"),c.src=AjaxRequest.themePath+"icons/folPlus.svg",$(i).store("tip:title",Contao.lang.expand),new Request.Contao({field:i}).post({action:"toggleStructure",id:l,state:0,REQUEST_TOKEN:Contao.request_token})):new Request.Contao({field:i,evalScripts:!0,onRequest:AjaxRequest.displayBox(Contao.lang.loading+" …"),onSuccess:function(e){var t=new Element("li",{id:l,class:"parent",styles:{display:"inline"}});if(new Element("ul",{class:"level_"+s,html:e}).inject(t,"bottom"),5==r)t.inject($(i).getParent("li"),"after");else{for(var n,a=!1,o=$(i).getParent("li");"element"==typeOf(o)&&(n=o.getNext("li"));)if((o=n).hasClass("tl_folder")){a=!0;break}a?t.inject(o,"before"):t.inject(o,"after")}t.getElements("a").each(function(e){e.href=e.href.replace(/&ref=[a-f0-9]+/,"&ref="+Contao.referer_id)}),$(i).store("tip:title",Contao.lang.collapse),c.src=AjaxRequest.themePath+"icons/folMinus.svg",window.fireEvent("structure"),AjaxRequest.hideBox(),window.fireEvent("ajax_change")}}).post({action:"loadStructure",id:l,level:s,state:1,REQUEST_TOKEN:Contao.request_token}),!1},toggleFileManager:function(n,a,e,o){n.blur();var t=$(a),i=$(n).getFirst("img");return t?"none"==t.getStyle("display")?(t.setStyle("display",null),i.src=AjaxRequest.themePath+"icons/folMinus.svg",$(n).store("tip:title",Contao.lang.collapse),new Request.Contao({field:n}).post({action:"toggleFileManager",id:a,state:1,REQUEST_TOKEN:Contao.request_token})):(t.setStyle("display","none"),i.src=AjaxRequest.themePath+"icons/folPlus.svg",$(n).store("tip:title",Contao.lang.expand),new Request.Contao({field:n}).post({action:"toggleFileManager",id:a,state:0,REQUEST_TOKEN:Contao.request_token})):new Request.Contao({field:n,evalScripts:!0,onRequest:AjaxRequest.displayBox(Contao.lang.loading+" …"),onSuccess:function(e){var t=new Element("li",{id:a,class:"parent",styles:{display:"inline"}});new Element("ul",{class:"level_"+o,html:e}).inject(t,"bottom"),t.inject($(n).getParent("li"),"after"),t.getElements("a").each(function(e){e.href=e.href.replace(/&ref=[a-f0-9]+/,"&ref="+Contao.referer_id)}),$(n).store("tip:title",Contao.lang.collapse),i.src=AjaxRequest.themePath+"icons/folMinus.svg",AjaxRequest.hideBox(),window.fireEvent("ajax_change")}}).post({action:"loadFileManager",id:a,level:o,folder:e,state:1,REQUEST_TOKEN:Contao.request_token}),!1},togglePagetree:function(n,a,e,t,o){n.blur(),Backend.getScrollOffset();var i=$(a),l=$(n).getFirst("img");return i?"none"==i.getStyle("display")?(i.setStyle("display",null),l.src=AjaxRequest.themePath+"icons/folMinus.svg",$(n).store("tip:title",Contao.lang.collapse),new Request.Contao({field:n}).post({action:"togglePagetree",id:a,state:1,REQUEST_TOKEN:Contao.request_token})):(i.setStyle("display","none"),l.src=AjaxRequest.themePath+"icons/folPlus.svg",$(n).store("tip:title",Contao.lang.expand),new Request.Contao({field:n}).post({action:"togglePagetree",id:a,state:0,REQUEST_TOKEN:Contao.request_token})):new Request.Contao({field:n,evalScripts:!0,onRequest:AjaxRequest.displayBox(Contao.lang.loading+" …"),onSuccess:function(e){var t=new Element("li",{id:a,class:"parent",styles:{display:"inline"}});new Element("ul",{class:"level_"+o,html:e}).inject(t,"bottom"),t.inject($(n).getParent("li"),"after"),t.getElements("a").each(function(e){e.href=e.href.replace(/&ref=[a-f0-9]+/,"&ref="+Contao.referer_id)}),$(n).store("tip:title",Contao.lang.collapse),l.src=AjaxRequest.themePath+"icons/folMinus.svg",AjaxRequest.hideBox(),window.fireEvent("ajax_change")}}).post({action:"loadPagetree",id:a,level:o,field:e,name:t,state:1,REQUEST_TOKEN:Contao.request_token}),!1},toggleFiletree:function(n,a,e,t,o,i){n.blur(),Backend.getScrollOffset();var l=$(a),s=$(n).getFirst("img");return l?"none"==l.getStyle("display")?(l.setStyle("display",null),s.src=AjaxRequest.themePath+"icons/folMinus.svg",$(n).store("tip:title",Contao.lang.collapse),new Request.Contao({field:n}).post({action:"toggleFiletree",id:a,state:1,REQUEST_TOKEN:Contao.request_token})):(l.setStyle("display","none"),s.src=AjaxRequest.themePath+"icons/folPlus.svg",$(n).store("tip:title",Contao.lang.expand),new Request.Contao({field:n}).post({action:"toggleFiletree",id:a,state:0,REQUEST_TOKEN:Contao.request_token})):new Request.Contao({field:n,evalScripts:!0,onRequest:AjaxRequest.displayBox(Contao.lang.loading+" …"),onSuccess:function(e){var t=new Element("li",{id:a,class:"parent",styles:{display:"inline"}});new Element("ul",{class:"level_"+i,html:e}).inject(t,"bottom"),t.inject($(n).getParent("li"),"after"),t.getElements("a").each(function(e){e.href=e.href.replace(/&ref=[a-f0-9]+/,"&ref="+Contao.referer_id)}),$(n).store("tip:title",Contao.lang.collapse),s.src=AjaxRequest.themePath+"icons/folMinus.svg",AjaxRequest.hideBox(),window.fireEvent("ajax_change")}}).post({action:"loadFiletree",id:a,folder:e,level:i,field:t,name:o,state:1,REQUEST_TOKEN:Contao.request_token}),!1},toggleSubpalette:function(a,o,e){a.blur();var t=$(o);t?a.value?(a.value="",a.checked="",t.setStyle("display","none"),t.getElements("[required]").each(function(e){e.set("required",null).set("data-required","")}),new Request.Contao({field:a}).post({action:"toggleSubpalette",id:o,field:e,state:0,REQUEST_TOKEN:Contao.request_token})):(a.value=1,a.checked="checked",t.setStyle("display",null),t.getElements("[data-required]").each(function(e){e.set("required","").set("data-required",null)}),new Request.Contao({field:a}).post({action:"toggleSubpalette",id:o,field:e,state:1,REQUEST_TOKEN:Contao.request_token})):new Request.Contao({field:a,evalScripts:!1,onRequest:AjaxRequest.displayBox(Contao.lang.loading+" …"),onSuccess:function(e,t){var n=new Element("div",{id:o,class:"subpal cf",html:e,styles:{display:"block"}}).inject($(a).getParent("div").getParent("div"),"after");t.javascript&&(document.write=function(e){var n="";e.replace(/<script src="([^"]+)"/i,function(e,t){n=t}),n&&Asset.javascript(n,{onLoad:function(){Browser.exec(t.javascript)}})},Browser.exec(t.javascript)),a.value=1,a.checked="checked",n.getElements("a").each(function(e){e.href=e.href.replace(/&ref=[a-f0-9]+/,"&ref="+Contao.referer_id)}),AjaxRequest.hideBox(),window.fireEvent("subpalette"),window.fireEvent("ajax_change")}}).post({action:"toggleSubpalette",id:o,field:e,load:1,state:1,REQUEST_TOKEN:Contao.request_token})},toggleVisibility:function(e,t,n){e.blur();var a,o,i,l,s,r,c=null,d=$(e).getFirst("img"),g=1==d.get("data-state"),u=e.getParent("div");return null===d.get("data-state")&&(g=-1==d.src.indexOf("invisible"),window.console&&console.warn('Using a visibility toggle without a "data-state" attribute is deprecated. Please adjust your Contao DCA file.')),u.hasClass("tl_right")?c=u.getPrevious("div").getElement("img"):u.hasClass("tl_listing_container")?(null===(c=e.getParent("td").getPrevious("td").getFirst("div.list_icon"))&&(c=e.getParent("td").getPrevious("td").getElement("div.cte_type")),null===c&&(c=e.getParent("tr").getFirst("td").getElement("div.list_icon_new"))):(o=u.getNext("div"))&&(o.hasClass("cte_type")&&(c=o),null===c&&(c=o.getFirst("div.list_icon"))),null!==c&&("img"==c.nodeName.toLowerCase()?(c.getParent("ul.tl_listing").hasClass("tl_tree_xtnd")?(i=c.get("data-icon"),l=c.get("data-icon-disabled"),null===i&&(i=c.src.replace(/(.*)\/([a-z0-9]+)_?\.(gif|png|jpe?g|svg)$/,"$1/$2.$3"),window.console&&console.warn('Using a row icon without a "data-icon" attribute is deprecated. Please adjust your Contao DCA file.')),null===l&&(l=c.src.replace(/(.*)\/([a-z0-9]+)_?\.(gif|png|jpe?g|svg)$/,"$1/$2_.$3"),window.console&&console.warn('Using a row icon without a "data-icon-disabled" attribute is deprecated. Please adjust your Contao DCA file.'))):((s=c.getParent("a"))&&-1==s.href.indexOf("contao/preview")&&(c=(o=s.getNext("a"))?o.getFirst("img"):new Element("img")),i=c.get("data-icon"),l=c.get("data-icon-disabled"),null===i&&(a=c.src.replace(/.*_([0-9])\.(gif|png|jpe?g|svg)/,"$1"),i=c.src.replace(/_[0-9]\.(gif|png|jpe?g|svg)/,(1==a.toInt()?"":"_"+(a.toInt()-1))+".$1").split(/[\\/]/).pop(),window.console&&console.warn('Using a row icon without a "data-icon" attribute is deprecated. Please adjust your Contao DCA file.')),null===l&&(a=c.src.replace(/.*_([0-9])\.(gif|png|jpe?g|svg)/,"$1"),l=c.src.replace(/(_[0-9])?\.(gif|png|jpe?g|svg)/,(a==c.src?"_1":"_"+(a.toInt()+1))+".$2").split(/[\\/]/).pop(),window.console&&console.warn('Using a row icon without a "data-icon-disabled" attribute is deprecated. Please adjust your Contao DCA file.'))),-1==i.indexOf("/")&&(i=AjaxRequest.themePath+(i.match(/\.svg$/)?"icons/":"images/")+i),-1==l.indexOf("/")&&(l=AjaxRequest.themePath+(l.match(/\.svg$/)?"icons/":"images/")+l),c.src=g?l:i):c.hasClass("cte_type")?g?(c.addClass("unpublished"),c.removeClass("published")):(c.addClass("published"),c.removeClass("unpublished")):(i=c.get("data-icon"),l=c.get("data-icon-disabled"),null===i&&(i=c.getStyle("background-image").replace(/(.*)\/([a-z0-9]+)_?\.(gif|png|jpe?g|svg)\);?$/,"$1/$2.$2"),window.console&&console.warn('Using a row icon without a "data-icon" attribute is deprecated. Please adjust your Contao DCA file.')),null===l&&(l=c.getStyle("background-image").replace(/(.*)\/([a-z0-9]+)_?\.(gif|png|jpe?g|svg)\);?$/,"$1/$2_.$3"),window.console&&console.warn('Using a row icon without a "data-icon-disabled" attribute is deprecated. 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