Bugs and enhancement requests related to the Undo/Redo commands (Menu Edit - Undo/Redo, Ctrl+Z/Y, respective toolbar arrows).
On a second thought, this probably isn't really needed, as a simple search for "undo" in the bug summary shows them all: https://bugs.documentfoundation.org/buglist.cgi?list_id=674036&query_format=advanced&resolution=---&short_desc=undo&short_desc_type=allwordssubstr
*** This bug has been marked as a duplicate of bug 100371 ***
Well, it is not the duplicate of bug 100371! 100371 is dedicated to LibreOffice Draw. Please reconsider.