Package: Emacs
Version: 29.1


As found via yasnippet's test suite, the new overlay code in Emacs-29
sometimes mistakenly runs the `modification-hooks` when the text *right
after* an (empty) overlay is deleted.  This can be seen in the attached
trace obtained while running yasnippet's
`delete-numberless-inner-snippet-issue-562` test.

In that trace we see a call

    (yas--on-protection-overlay-modification #<overlay from 1 to 1 in  *temp*-896992> nil 1 5)

i.e. a call where the `modification-hooks` function
(`yas--on-protection-overlay-modification`) is called for a deletion of
text between 1 and 5 while the overlay itself does not contain any of
those characters since the overlay is empty, at BOB.

According to the Texinfo doc:

    ‘modification-hooks’
         This property’s value is a list of functions to be called if any
         character within the overlay is changed or if text is inserted
         strictly within the overlay.

The behavior in Emacs<29 obeys the Texinfo doc.


        Stefan