Dev: Tweaks for PHPStan

It is frustrating that it can't see the write on null default properties
which are _getSet(), but psr12 means that you can't initialise a
property with `null` (which would remove the error) since properties are
null by default!

Editor/Options.php

@@ -309,7 +309,7 @@ public function where($_ = null)
 	 *
 	 * @internal
 	 */
-	public function exec($db, $refresh, $search = null)
+	public function exec($db, $refresh, $search=null)
 	{
 		// If search only, and not a search action, then just return false
 		if ($this->searchOnly() && !$search) {

phpstan-baseline.neon

@@ -200,6 +200,11 @@ parameters:
 			count: 1
 			path: Editor/Field.php
 
+		-
+			message: "#^Property DataTables\\\\Editor\\\\Field\\:\\:\\$_upload is never written, only read\\.$#"
+			count: 1
+			path: Editor/Field.php
+
 		-
 			message: "#^Strict comparison using \\=\\=\\= between \\(callable\\(mixed\\)\\: string\\)\\|false and true will always evaluate to false\\.$#"
 			count: 1
@@ -320,6 +325,11 @@ parameters:
 			count: 1
 			path: Editor/Options.php
 
+		-
+			message: "#^Property DataTables\\\\Editor\\\\Options\\:\\:\\$_customFn is never written, only read\\.$#"
+			count: 1
+			path: Editor/Options.php
+
 		-
 			message: "#^Property DataTables\\\\Editor\\\\Options\\:\\:\\$_limit is never written, only read\\.$#"
 			count: 1