bug#16636: 24.3.50; REGRESSION: y/n file dialog is only flashed; input is not read

[Drew Adams]

> You should hear the "ding" that is sounded when you type C-g or
> dismiss a menu.  (And the file in question should have been already
> visited inside Emacs before the "in another Emacs session" step,
> otherwise Emacs has no need to display any dialogs.)

OK, but I had sound turned off (as I usually do).  But that's a
good reminder.  Still, that does not distinguish this situation
from, as you say, C-g and other events.

> > I look in *Messages* but nothing is recorded there ("normal").
> 
> You should see "Quit" there, which is a sign that none of the
> possible selections were chosen, i.e. the dialog was dismissed
> without making a selection.

Maybe Quit was there, but there are lots of Quits in *Messages*.
Again, that does not distinguish this situation.

And I did not dismiss any dialog without making a selection.
I never saw any dialog.  I never saw any question posed, in any
manner.

> >  There should have been a file dialog displayed, and it should
> > have waited for me to click y or n to dismiss it.
> >
> > Do `M-x debug-on-entry diredp-mouse-find-file-other-frame', then
> > repeat: click `M-mouse-2' on the same (modified) file.  Walk
> > through the debugger and you will see the file dialog displayed
> > as it should be
> 
> Displayed, yes.  But not "as it should be": the appearance is
> entirely different,

Different from what?  What I see when using the debugger is what
I normally see when Emacs asks a question using a dialog box.

> as Emacs tried to emulate a dialog box with a menu.

No idea what that means or why it is important.  I saw no
question asked, regardless of how the question might be displayed.

> But for a "simple dialog" such as yes/no, Emacs should have
> displayed a MessageBox instead.

See previous.

> Sorry, this was my bad: some code which supported this use case was
> inadvertently deleted when the TTY menus were implemented.
> 
> Now fixed in trunk revision 116260.

OK, thanks.  I understood only part of what you wrote.  But this
part I understand, at least.  Thx.