Posts, Post Types: Increase the input field's width in the Slug metabox.

This changeset adds a `large-text` attribute and removes the `size` attribute of the text input field located in the Slug metabox. It improves its usability, at least for as long as the Slug metabox is available in the Classic Editor.

Props ABTOP, nacin, helen, sabernhardt, abitofmind, tyxla, audrasjb.
Fixes #16346.


git-svn-id: https://develop.svn.wordpress.org/trunk@55113 602fd350-edb4-49c9-b593-d223f7449a82

Author: audrasjb

src/wp-admin/includes/meta-boxes.php

@@ -888,7 +888,7 @@ function post_slug_meta_box( $post ) {
 	/** This filter is documented in wp-admin/edit-tag-form.php */
 	$editable_slug = apply_filters( 'editable_slug', $post->post_name, $post );
 	?>
-<label class="screen-reader-text" for="post_name"><?php _e( 'Slug' ); ?></label><input name="post_name" type="text" size="13" id="post_name" value="<?php echo esc_attr( $editable_slug ); ?>" />
+<label class="screen-reader-text" for="post_name"><?php _e( 'Slug' ); ?></label><input name="post_name" type="text" class="large-text" id="post_name" value="<?php echo esc_attr( $editable_slug ); ?>" />
 	<?php
 }