feat(files_sharing): add hidden killswitch for the new sharing dialog

Add a hidden appconfig `files_sharing sharing_dialog_enabled` (BOOL,
default true) surfaced to the sidebar via initial state. When enabled
the sidebar uses the new unified sharing dialog; setting it to false
temporarily restores the legacy inline sharing UI.

Assisted-by: ClaudeCode:claude-opus-4-8
Signed-off-by: skjnldsv <skjnldsv@protonmail.com>

Author: skjnldsv

apps/files_sharing/lib/Config/ConfigLexicon.php

@@ -26,6 +26,7 @@ class ConfigLexicon implements ILexicon {
 	public const EXCLUDE_RESHARE_FROM_EDIT = 'shareapi_exclude_reshare_from_edit';
 	public const UPDATE_CUTOFF_TIME = 'update_cutoff_time';
 	public const USER_NEEDS_SHARE_REFRESH = 'user_needs_share_refresh';
+	public const SHARING_DIALOG_ENABLED = 'sharing_dialog_enabled';
 
 	#[\Override]
 	public function getStrictness(): Strictness {
@@ -40,6 +41,10 @@ public function getAppConfigs(): array {
 			new Entry(self::EXCLUDE_RESHARE_FROM_EDIT, ValueType::BOOL, false, 'Exclude reshare permission from "Allow editing" bundled permissions'),
 
 			new Entry(self::UPDATE_CUTOFF_TIME, ValueType::FLOAT, 3.0, 'Maximum time in second during which we update the share data immediately before switching to only marking the user'),
+
+			// Hidden killswitch: enables the new unified sharing dialog UI in the sidebar.
+			// Set to false to temporarily restore the legacy sharing inputs and menus.
+			new Entry(self::SHARING_DIALOG_ENABLED, ValueType::BOOL, true, 'Use the new unified sharing dialog in the files sidebar instead of the legacy inline UI', true),
 		];
 	}
 

apps/files_sharing/lib/Listener/LoadSidebarListener.php

@@ -47,8 +47,11 @@ public function handle(Event $event): void {
 		$showExternalSharing = $appConfig->getValueBool('files_sharing', 'outgoing_server2server_share_enabled', true)
 			|| $appConfig->getValueBool('core', 'shareapi_allow_links', true);
 
+		$sharingDialogEnabled = $appConfig->getValueBool('files_sharing', ConfigLexicon::SHARING_DIALOG_ENABLED, true);
+
 		$this->initialState->provideInitialState('showFederatedSharesAsInternal', $showFederatedAsInternal);
 		$this->initialState->provideInitialState('showFederatedSharesToTrustedServersAsInternal', $showFederatedToTrustedAsInternal);
 		$this->initialState->provideInitialState('showExternalSharing', $showExternalSharing);
+		$this->initialState->provideInitialState('sharingDialogEnabled', $sharingDialogEnabled);
 	}
 }

apps/files_sharing/src/services/ConfigService.ts

@@ -344,4 +344,13 @@ export default class Config {
 	get showExternalSharing(): boolean {
 		return loadState('files_sharing', 'showExternalSharing', true)
 	}
+
+	/**
+	 * Whether the new unified sharing dialog replaces the legacy inline sharing UI.
+	 * Hidden killswitch (appconfig files_sharing sharing_dialog_enabled); set to
+	 * false to temporarily restore the legacy inputs and menus.
+	 */
+	get sharingDialogEnabled(): boolean {
+		return loadState('files_sharing', 'sharingDialogEnabled', true)
+	}
 }