Show the Enable auto-updates toggle for the self-updater

WordPress only renders the "Enable auto-updates" toggle for a plugin that
appears in the update_plugins transient's response or no_update list, which
is what sets core's update-supported flag. UpdateChecker only populated the
response side (when a newer release existed), so between releases the plugin
was absent from the transient and the toggle never showed.

provideUpdate() now returns a no_update payload (installed version, empty
package) whenever no newer release is offered — including when the release
lookup fails — so the plugin stays in the transient and the toggle appears.
The response path (one-click and unattended updates) is unchanged.

Bumps to 1.1.1 so the fix ships to installed sites via the self-updater.

Co-Authored-By: Claude Opus 4.8 <[email protected]>

tests/Unit/Update/UpdateCheckerTest.php

@@ -32,6 +32,22 @@ class UpdateCheckerTest extends TestCase
         return ['name' => $name, 'browser_download_url' => self::PACKAGE_URL];
     }
 
+    /**
+     * The payload provideUpdate() returns when no newer release is offered.
+     * Core files this under the transient's `no_update` list, which is what
+     * makes the "Enable auto-updates" toggle appear. USC_VERSION is 1.0.0 in
+     * the test bootstrap.
+     */
+    private function noUpdatePayload(): array
+    {
+        return [
+            'slug'    => 'unsupervised-schedular',
+            'version' => '1.0.0',
+            'url'     => UpdateChecker::REPO_URL,
+            'package' => '',
+        ];
+    }
+
     public function testRegisterHooksHostnameFilter(): void
     {
         Filters\expectAdded('update_plugins_git.unsupervised.ca')->once();
@@ -109,7 +125,7 @@ class UpdateCheckerTest extends TestCase
         self::assertFalse($result);
     }
 
-    public function testNoUpdateWhenReleaseIsNotNewer(): void
+    public function testNoUpdatePayloadWhenReleaseIsNotNewer(): void
     {
         Functions\when('plugin_basename')->justReturn(self::PLUGIN_FILE);
         Functions\when('get_transient')->justReturn(false);
@@ -118,7 +134,9 @@ class UpdateCheckerTest extends TestCase
 
         $result = (new UpdateChecker())->provideUpdate(false, [], self::PLUGIN_FILE);
 
-        self::assertFalse($result);
+        // Current version → core files this under `no_update` so the
+        // auto-update toggle stays visible; no package to install.
+        self::assertSame($this->noUpdatePayload(), $result);
     }
 
     public function testUsesCachedReleaseWithoutHittingApi(): void
@@ -134,7 +152,7 @@ class UpdateCheckerTest extends TestCase
         self::assertSame('2.0.0', $result['version']);
     }
 
-    public function testApiFailureIsCachedAndReturnsUpdateUnchanged(): void
+    public function testApiFailureIsCachedAndStillReportsUpdateSupport(): void
     {
         Functions\when('plugin_basename')->justReturn(self::PLUGIN_FILE);
         Functions\when('get_transient')->justReturn(false);
@@ -150,10 +168,12 @@ class UpdateCheckerTest extends TestCase
 
         $result = (new UpdateChecker())->provideUpdate(false, [], self::PLUGIN_FILE);
 
-        self::assertFalse($result);
+        // Even with the lookup failed we still return the `no_update` payload,
+        // so the auto-update toggle does not flicker away during a Gitea blip.
+        self::assertSame($this->noUpdatePayload(), $result);
     }
 
-    public function testNon200ResponseReturnsUpdateUnchanged(): void
+    public function testNon200ResponseReturnsNoUpdatePayload(): void
     {
         Functions\when('plugin_basename')->justReturn(self::PLUGIN_FILE);
         Functions\when('get_transient')->justReturn(false);
@@ -162,7 +182,7 @@ class UpdateCheckerTest extends TestCase
 
         $result = (new UpdateChecker())->provideUpdate(false, [], self::PLUGIN_FILE);
 
-        self::assertFalse($result);
+        self::assertSame($this->noUpdatePayload(), $result);
     }
 
     public function testPicksFirstZipAssetAndSkipsOthers(): void
@@ -181,7 +201,7 @@ class UpdateCheckerTest extends TestCase
         self::assertSame(self::PACKAGE_URL, $result['package']);
     }
 
-    public function testReleaseWithoutZipAssetOffersNoUpdate(): void
+    public function testReleaseWithoutZipAssetOffersNoUpdatePayload(): void
     {
         Functions\when('plugin_basename')->justReturn(self::PLUGIN_FILE);
         Functions\when('get_transient')->justReturn(false);
@@ -192,10 +212,12 @@ class UpdateCheckerTest extends TestCase
 
         $result = (new UpdateChecker())->provideUpdate(false, [], self::PLUGIN_FILE);
 
-        self::assertFalse($result);
+        // No installable package means no update to offer, but we still keep
+        // the plugin in `no_update` so the toggle shows.
+        self::assertSame($this->noUpdatePayload(), $result);
     }
 
-    public function testMalformedApiBodyOffersNoUpdate(): void
+    public function testMalformedApiBodyOffersNoUpdatePayload(): void
     {
         Functions\when('plugin_basename')->justReturn(self::PLUGIN_FILE);
         Functions\when('get_transient')->justReturn(false);
@@ -207,6 +229,6 @@ class UpdateCheckerTest extends TestCase
 
         $result = (new UpdateChecker())->provideUpdate(false, [], self::PLUGIN_FILE);
 
-        self::assertFalse($result);
+        self::assertSame($this->noUpdatePayload(), $result);
     }
 }