just tried to filter out some categories for the Wallpaper Abyss and was unable to do it using filter. After using filter I noticed that all categories lost their "checked" state. I am unable to search and check wanted (or uncheck unwanted) category because each time it will reset it checked state.
Also it is quite slow for big lists, seems like it redraw tree list while removing/refilling list items and so it slow down filter process.
