Add admin email verification screen. Shown every six months after an admin has logged in.

Also includes WPCS fixes for wp-login.php.

Props andraganescu, boemedia, lessbloat, azaozz.
See #46349.

git-svn-id: https://develop.svn.wordpress.org/trunk@45757 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/css/login.css

@@ -131,6 +131,17 @@ p {
 	box-shadow: 0 1px 3px rgba(0, 0, 0, 0.13);
 }
 
+.login-action-confirm_admin_email #login {
+	width: 60vw;
+	margin-top: -2vh;
+}
+
+@media screen and (max-width: 782px) {
+	.login-action-confirm_admin_email #login {
+		width: 100vw;
+	}
+}
+
 .login form .forgetmenot {
 	font-weight: 400;
 	float: left;
@@ -141,6 +152,36 @@ p {
 	float: right;
 }
 
+.login .admin-email-confirm-form .submit {
+	text-align: center;
+}
+
+.admin-email__later {
+	text-align: left;
+}
+
+.login form p.admin-email__details {
+	margin: 1.1em 0;
+}
+
+.login h1.admin-email__heading {
+	border-bottom: 1px rgb(241, 241, 241) solid;
+	color: rgb(95, 95, 95);
+	font-weight: normal;
+	padding-bottom: 0.5em;
+	text-align: left;
+}
+
+.admin-email__actions div {
+	padding-top: 1.5em;
+}
+
+.login .admin-email__actions .button-primary {
+	float: none;
+	margin-left: 0.25em;
+	margin-right: 0.25em;
+}
+
 #login form p {
 	margin-bottom: 0;
 }

src/wp-admin/includes/upgrade.php

@@ -815,6 +815,10 @@ function upgrade_all() {
 		upgrade_510();
 	}
 
+	if ( $wp_current_db_version < 45744 ) {
+		upgrade_530();
+	}		
+
 	maybe_disable_link_manager();
 
 	maybe_disable_automattic_widgets();
@@ -2114,6 +2118,19 @@ function upgrade_510() {
 	delete_site_option( 'upgrade_500_was_gutenberg_active' );
 }
 
+/**
+ * Executes changes made in WordPress 5.3.0.
+ *
+ * @ignore
+ * @since 5.3.0
+ */
+function upgrade_530() {
+	// Do `add_option()` rather than overwriting with `update_option()` as this may run
+	// after an admin was redirected to the email verification screen,
+	// and the option was updated.
+	add_option( 'admin_email_lifespan', 0 );
+}
+
 /**
  * Executes network-level upgrade routines.
  *

src/wp-admin/options-general.php

@@ -108,7 +108,7 @@ if ( ! is_multisite() ) {
 <?php } ?>
 
 <tr>
-<th scope="row"><label for="new_admin_email"><?php _e( 'Email Address' ); ?></label></th>
+<th scope="row"><label for="new_admin_email"><?php _e( 'Administration Email Address' ); ?></label></th>
 <td><input name="new_admin_email" type="email" id="new_admin_email" aria-describedby="new-admin-email-description" value="<?php form_option( 'admin_email' ); ?>" class="regular-text ltr" />
 <p class="description" id="new-admin-email-description"><?php _e( 'This address is used for admin purposes. If you change this we will send you an email at your new address to confirm it. <strong>The new address will not become active until confirmed.</strong>' ); ?></p>
 <?php

src/wp-includes/version.php

@@ -20,7 +20,7 @@ $wp_version = '5.3-alpha-45282-src';
  *
  * @global int $wp_db_version
  */
-$wp_db_version = 44719;
+$wp_db_version = 45744;
 
 /**
  * Holds the TinyMCE version