(Win 5.2a)
Open Library in grid view with the Info panel open.
Type something into the Find box to filter the library
Type something different into the Find box
Type yet another filter in
Press Ctrl+Z and notice that it undoes your latest change.
Press Ctrl+Z again and it goes back to what you started with.
(Note that I've come to rely on this functionality in the way I use the Library with all the filtering I do.)
Now type something else into the Find box.
Type yet another thing into the Find box.
Select one of the books that matches this latest filter which has some tags assigned to it.
Click on one of the tags.
The Library is now filtered by that tag.
Press Ctrl+Z.
Result: Nothing happens!
The undo stack has been cleared, and you can't go back to the previous way you had the library filtered. Very unfortunate for those of us who use filtering a lot.
