[elpa] externals/undo-tree updated (bf2e9ba0c9 -> 1f8d005409)

[Stefan Monnier]

monnier pushed a change to branch externals/undo-tree.

      from  bf2e9ba0c9 Print complete objects when saving undo-tree history
       new  5da2a7aee9 Implement new undo-tree save format.
       new  25709c426d Add missing Package-Requires header for queue dependency.
       new  35a438bee8 Fix how undo-tree-viualizer-timestamps|diff are set 
buffer-local.
       new  cbe0c708d8 Fix potential insidious list creation bugs.
       new  594ed6a788 Fix URLs in package headers.
       new  42aab056e3 Fix bug in detection of nodes corresponding to 
unmodified buffers.
       new  2bf5e230f1 Update contact email address in package headers.
       new  7171865096 Merge remote-tracking branch 'upstream/undo-tree/main' 
into externals/undo-tree
       new  1f8d005409 * undo-tree.el: Various cosmetic changes


Summary of changes:
 .gitignore   |   2 +
 undo-tree.el | 677 +++++++++++++++++++++++++++++------------------------------
 2 files changed, 330 insertions(+), 349 deletions(-)