src/vs/workbench/contrib/extensions/browser/extensionsActions.ts/ToggleSyncExtensionAction/update
class ToggleSyncExtensionAction:	update(): void {
		this.enabled = !!this.extension && this.userDataSyncEnablementService.isEnabled() && this.extension.state === ExtensionState.Installed;
		if (this.extension) {
			const isIgnored = this.extensionsWorkbenchService.isExtensionIgnoredToSync(this.extension);
			this.class = isIgnored ? ToggleSyncExtensionAction.IGNORED_SYNC_CLASS : ToggleSyncExtensionAction.SYNC_CLASS;
			this.tooltip = isIgnored ? localize('ignored', "This extension is ignored during sync") : localize('synced', "This extension is synced");
		}
	}