bug#23341: x-show-tip does not respect the value of tooltip-hide-delay, and the default tooltip timeout isn't configurable

[Po Lu]

Lars Ingebrigtsen <larsi@gnus.org> writes:

>> If code calls `x-show-tip' directly, then that means it explictly
>> wants a 5 second delay: no more, no less.

> The user should be able to override what they want.

So why don't we have variables enabling the user to customize the
"default" value of each optional parameter to every internal function,
such as the default values of `default-filename', `mustmatch' and
`only-dir-p' in Fx_file_dialog?  Or the default `action' in
`x-begin-drag'?

This specific case is even worse, since we now have two different
variables for customizing two subtly different kinds of "tooltip hide
delay".

That way lies madness.