std.signals crashes GtkD gui application when SpinButton tied to signal.

[Enjoys Math via Digitalmars-d-learn]

On Friday, 5 February 2016 at 06:52:11 UTC, Enjoys Math wrote:
>
> I have two spin buttons connected to the width and height of 2d 
> objects in a scene.  Using
>
>     mixin std.signals.Signal!(double, double) dimentionChanged;
>
> and there is a growing delay that happens not caused by the 
> rendering code, the transform code, or the triggering code (I 
> used a timer to measure).
>
> Then switching over to a D delegate, the issue went away.
>
> It starts to freeze the gui app so that you can't do much at 
> all.
>
> Thus std.signals can't handle a large number of signals maybe 
> 50 / second.  It causes some weird delays to happen.
>
> Would anyone like to see my source code?
>
> You need:
> Visual D
> GtkD-3.(latest) (32-bit)
> Gtk Runtime

Wait it's happening again.  It's sporadic I guess.