[XForms] Canvas / button interaction

[Clive Stubbings]

I have recently been doing that dreaded periodic fork-lift linux update. It 
always throws up some troublesome issues. This one is particularly wierd.

I have an old app, been working for years. Tried running it on a new system and 
various bits of the gui didn't display right. It looked like a 'flush' issue 
but fl_update_display() did not help.
. 
However the issue shows up even if I run the old app on the old system but put 
just the display over the network onto the new platform. New platform is Arch 
Linux. Building against different libraries didn't change anything. The arch 
xforms package is 1.0.94pre4-1, I was using something older..

I boiled it down to the example below. If the canvas object is created then the 
checkbutton does not light when you press it. If the canvas object is not 
created, the check button works fine. I believe that the object sees the mouse 
button press because in the bigger app, I could see callbacks happening.

On my old system this works fine in both cases. So my take is this is an X 
server interaction issue with a new Xorg. The X is X.Org X Server 1.11.4
Release Date: 2012-01-27, X Protocol Version 11, Revision 0.
Or am I missing something obvious.

Anyone got any ideas?

/*

If I build

        gcc test1.c -lforms -o test1

the button works, but if I build

        gcc -DCANVAS test1.c -lforms -o test1

It doesn't..

*/
#include <stdio.h>
#include <forms.h>

typedef struct {
        FL_FORM *main;
        void *vdata;
        char *cdata;
        long  ldata;
        FL_OBJECT *image;
        FL_OBJECT *toggle;
} FD_main;


FD_main *create_form_main(void)
{
        FL_OBJECT *obj;
        FD_main *fdui = (FD_main *) fl_calloc(1, sizeof(*fdui));

        fdui->main = fl_bgn_form(FL_NO_BOX, 300, 200);
        obj = fl_add_box(FL_UP_BOX,0,0,1010,565,"");
#ifdef CANVAS
        fdui->image = obj = fl_add_canvas(FL_NORMAL_CANVAS,10,10,80,50,"");
#endif
        fdui->toggle = obj = 
fl_add_checkbutton(FL_PUSH_BUTTON,190,20,40,40,"Check");
        fl_end_form();
        fdui->main->fdui = fdui;
        return fdui;
}

main(int argc, char *argv[])
{
        FD_main *maingui;

        fl_initialize(&argc, argv, "Test", NULL, 0);
        maingui= create_form_main();
        fl_show_form(maingui->main,FL_PLACE_POSITION,FL_FULLBORDER,"test");

        while (1) {
                fl_do_forms();
        }
}



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Cheers
Clive