refactor(preview): use getProviders() in mime support and availability checks

Signed-off-by: Josh <josh.t.richards@gmail.com>

lib/private/PreviewManager.php

@@ -69,13 +69,13 @@ class PreviewManager implements IPreview {
 	private ?Generator $generator = null;
 	protected bool $providerListDirty = false;
 	protected bool $registeredCoreProviders = false;
-	/**
-	 * @var array<string, list<ProviderClosure>> $providers
-	 */
+
+	/** @var array<string, list<ProviderClosure>> $providers */
 	protected array $providers = [];
 
 	/** @var array mime type => support status */
 	protected array $mimeTypeSupportMap = [];
+
 	/** @var ?list<class-string<IProviderV2>> $defaultProviders */
 	protected ?array $defaultProviders = null;
 
@@ -119,9 +119,6 @@ class PreviewManager implements IPreview {
 		$this->providerListDirty = true;
 	}
 
-	/**
-	 * Get all providers
-	 */
 	#[\Override]
 	public function getProviders(): array {
 		if (!$this->enablePreviews) {
@@ -212,9 +209,7 @@ class PreviewManager implements IPreview {
 			return $this->mimeTypeSupportMap[$mimeType];
 		}
 
-		$this->registerCoreProviders();
-		$this->registerBootstrapProviders();
-		$providerMimeTypes = array_keys($this->providers);
+		$providerMimeTypes = array_keys($this->getProviders());
 		foreach ($providerMimeTypes as $supportedMimeType) {
 			if (preg_match($supportedMimeType, $mimeType)) {
 				$this->mimeTypeSupportMap[$mimeType] = true;
@@ -233,7 +228,6 @@ class PreviewManager implements IPreview {
 
 		$fileMimeType = $mimeType ?? $file->getMimeType();
 
-		$this->registerCoreProviders();
 		if (!$this->isMimeSupported($fileMimeType)) {
 			return false;
 		}
@@ -243,7 +237,7 @@ class PreviewManager implements IPreview {
 			return false;
 		}
 
-		foreach ($this->providers as $supportedMimeType => $providers) {
+		foreach ($this->getProviders() as $supportedMimeType => $providers) {
 			if (preg_match($supportedMimeType, $fileMimeType)) {
 				foreach ($providers as $providerClosure) {
 					$provider = $this->helper->getProvider($providerClosure);