Posts, Post Types: Improve sanitisation of templates' post types.

Prevents post type templates ignoring post types due to invalid characters. Each entry in the `Template Post Type` comment is run through `sanitize_key()` to match the sanitisation used by `register_post_type()`.

Fixes #38766.


git-svn-id: https://develop.svn.wordpress.org/trunk@39236 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/data/themedir1/page-templates/38766/no-trailing-period-post-types.php

@@ -0,0 +1,5 @@
+<?php
+/*
+   Template Name: No Trailing Period
+   Template Post Type: period, full-stop
+ */

tests/phpunit/data/themedir1/page-templates/38766/tilde-post-types.php

@@ -0,0 +1,7 @@
+<?php
+/*
+   Template Name: Tilde in Post Type.
+   Template Post Type: period, full~stop
+
+   This template should be applied to the `period` post type and ignored by the `full-stop` post type.
+ */

tests/phpunit/data/themedir1/page-templates/38766/trailing-comma-post-types.php

@@ -0,0 +1,5 @@
+<?php
+/*
+   Template Name: Trailing Comma,
+   Template Post Type: period, full-stop,
+ */

tests/phpunit/data/themedir1/page-templates/38766/trailing-period-post-types.php

@@ -0,0 +1,5 @@
+<?php
+/*
+   Template Name: Trailing Period.
+   Template Post Type: period, full-stop.
+ */

tests/phpunit/data/themedir1/page-templates/38766/trailing-period-whitespace-post-types.php

@@ -0,0 +1,5 @@
+<?php
+/*
+   Template Name: Trailing Period, White Space.
+   Template Post Type: period, full-stop. 	
+ */

tests/phpunit/data/themedir1/page-templates/38766/trailing-whitespace-period-post-types.php

@@ -0,0 +1,5 @@
+<?php
+/*
+   Template Name: Trailing White Space, Period.
+   Template Post Type: period, full-stop 	 .
+ */