Adding "sort" to the viewer toolbar

[tylenolthumb]

Hello, I love the program. Please consider adding a "sort" button to the viewer toolbar. Right now it's only available on the browser toolbar. However, sometimes I use normal windows to view the contents of a folder, then click on the image file, which opens up the XnView viewer, which doesn't have the "sort" option and that makes navigating image forward and backward difficult because sometimes I switch to sort by name or sometimes sort by date. It would be cool if that the sort option is in the viewer itself so the sorting method can be changed on the fly. Please consider, thank you!