Enable search from playlists

Fixes GH-222

README.md

@@ -38,7 +38,8 @@ Doing so isn't fatal (it's not a secret), but it is annoying for other contribut
     * Similar tracks for an artist (sometimes called "radio") can now be displayed
 * Directories can be starred.
 * Recover from situations where the cover file was deleted from the filesystem.
-* Can create server playlists from the playlist view.
+* Searches can be performed from the playlist view.
+* Server playlists can be created from the playlist view.
 * Allow multiple items to be selected in searches.
 * Fix covers being deleted by the system on macOS 15.
 * Fix searches being ran twice.

Submariner/SBDatabaseController.m

@@ -1968,6 +1968,12 @@ - (void)pageController:(NSPageController *)pageController didTransitionToObject:
     } else if ([navItem isKindOfClass: SBServerNavigationItem.class]) {
         [searchToolbarItem setEnabled: YES];
         [searchField setPlaceholderString: @"Server Search"];
+    } else if ([navItem isKindOfClass: SBPlaylistNavigationItem.class]) {
+        [searchToolbarItem setEnabled: YES];
+        SBPlaylistNavigationItem *playlistNavItem = (SBPlaylistNavigationItem*)navItem;
+        SBPlaylist *playlist = playlistNavItem.playlist;
+        // this does seem to set self.server in usage, so we don't need to special case search:
+        [searchField setPlaceholderString: playlist.server != nil ? @"Server Search" : @"Local Search"];
     } else {
         [searchToolbarItem setEnabled: NO];
         [searchField setPlaceholderString: @""];