[Octave-patch-tracker] [patch #7990] Add builtin Qt equivalents of UI dialogs, i.e., , qterrordlg, qtinputdlg, etc.

[John W. Eaton]

Follow-up Comment #11, patch #7990 (project octave):

I think you are misunderstanding what I mean when I say "hook/callback"
functions.

What I am proposing is that instead of calling a function like "qterrdlg"
directly, or by name using feval or eval, an equivalent function would be
called through a function handle.  The function handle is installed by the
GUI, so Octave itself does not have to know anything about the name of the
function.  All Octave must do is make the function call if the function handle
is defined.

This approach has nothing to do with Qt slots and signals and does not
conflict with using them.

Even if a function is built in, a user could accidentally have a function
calld qterrdlg in the path so that the built-in function won't be called.

It's not impossible to screw things up if we call these functions through
callbacks, but it seems it would be somewhat harder to do.

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