bug#62250: 29.0.60; Allow context menu from text properties to not override everything

[Juri Linkov]

>> Actually, a member of context-menu-functions can override the
>> previous menu it receives as an argument.  And the last member
>> always wins by overriding the whole menu.  So it's just a question
>> of ordering the members of context-menu-functions.
>
> Right.  What I suggested would make the overriding independent of the
> ordering of the members, which also (typically) influences the order of
> the menu items.  But maybe overriding the menu is not such a common
> use-case anyway, and either mechanism is sufficient.

What I still don't understand is why a function in the middle of
context-menu-functions should be able to say "I'm the boss" and
override everything that comes later.  Maybe this could be
implemented as well if needed, but the current implementation already
allows adding such a function to the end by specifying quite a large
value for the argument DEPTH of `add-hook'.