An icon, a Check again that checks, and the auto-update rule written down

Three gaps found by being asked plain questions about it.

**The auto-update toggle was a promise nobody had checked.** offer_update()
answers even when the installed version is current, on the reasoning that the
answer has to land in WordPress's no_update list for the "Enable auto-updates"
link to exist at all. That was a comment and an intention; it is now an
assertion against the real WP_Plugins_List_Table, which is where the flag is
actually read:

    $plugin_data = array_merge( (array) $plugin_info->no_update[ $plugin_file ],
                               array( 'update-supported' => true ), $plugin_data );

A plugin in neither response nor no_update gets "Auto-updates are not available
for this plugin" while looking entirely healthy.

**An icon.** Without one, Dashboard → Updates shows a generic grey plug.
assets/icon.svg, handed over in the offer's icons key, served from the shop's
own copy rather than the release host — one fewer thing that must be reachable
for wp-admin to render, and it cannot go mixed content on an HTTPS shop. Drawn
as paths rather than <text>: an SVG that leans on a font renders differently on
every machine, and this one is shown at about 40px, which is the size where
that is the difference between a mark and a smudge.

**"Check again" now checks again.** The six-hour cache is right for the check
WordPress runs twice a day and wrong for a link whose whole promise is that it
looks now. Publishing a release and then clicking it showed nothing for up to
six hours, which reads exactly like a broken updater.

And docs/REUSE.md was missing all of this: it covered Update URI, where to
instantiate the updater and making the repo public, but not the one rule that
is genuinely easy to get wrong.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

includes/class-updater.php

@@ -55,6 +55,9 @@ class WC_EDM_Updater {
 		// update, and the plugins screen keeps offering a version already
 		// installed.
 		add_action( 'upgrader_process_complete', array( $this, 'forget' ), 10, 0 );
+
+		// And "Check again" has to actually check again.
+		add_action( 'admin_init', array( $this, 'forget_on_force_check' ) );
 	}
 
 	/**
@@ -123,6 +126,18 @@ class WC_EDM_Updater {
 			'tested'       => $release['tested'],
 			'requires'     => isset( $plugin_data['RequiresWP'] ) ? $plugin_data['RequiresWP'] : '',
 			'requires_php' => isset( $plugin_data['RequiresPHP'] ) ? $plugin_data['RequiresPHP'] : '',
+			// Without this, Dashboard → Updates shows the generic grey plug
+			// next to the plugin. WordPress takes the first of svg, 2x, 1x,
+			// default that is set.
+			//
+			// Served from the shop's own copy of the plugin rather than from
+			// the release host: it is one fewer thing that has to be up and
+			// reachable for wp-admin to render correctly, it cannot go mixed
+			// content on an HTTPS shop, and the icon is in the zip anyway.
+			'icons'        => array(
+				'svg'     => WC_EDM_PLUGIN_URL . 'assets/icon.svg',
+				'default' => WC_EDM_PLUGIN_URL . 'assets/icon.svg',
+			),
 		);
 	}
 
@@ -133,6 +148,27 @@ class WC_EDM_Updater {
 		delete_transient( self::TRANSIENT );
 	}
 
+	/**
+	 * Honour the "Check again" link on Dashboard → Updates.
+	 *
+	 * The six-hour cache is right for the check WordPress runs twice a day on
+	 * its own, and wrong for a button whose entire promise is that it looks
+	 * right now. Without this, someone who has just published a release clicks
+	 * it, sees nothing, and concludes the update mechanism is broken.
+	 *
+	 * No nonce to verify: this reads a link WordPress itself renders, and the
+	 * only effect is discarding a cache — the worst a forged request achieves
+	 * is one extra HTTP GET.
+	 */
+	public function forget_on_force_check() {
+		// phpcs:ignore WordPress.Security.NonceVerification.Recommended
+		if ( empty( $_GET['force-check'] ) || ! current_user_can( 'update_plugins' ) ) {
+			return;
+		}
+
+		$this->forget();
+	}
+
 	/**
 	 * Read the newest release from the repository.
 	 *