From: "J. P. Mellor" <jpmellor@ai.mit.edu>
>seems to be a problem with canvases and graphics exposes.
>These events cause fl_do_forms() to return. Also setting a canvas
>handler for GraphicsExpose doesn't help.
> if (xev->xbutton.button == Button1) {
> display = fl_get_display();
> printf("Button 1\n");
> XCopyArea(display, win, save, DefaultGC(display, DefaultScreen(display)),
> 0, 0, mark_width, mark_height, 0, 0);
> }
When you copy the window to the pixmap, the GraphicsExpose
event is generated for the pixmap, not the canvas window.
Thus setting a handler for the canvas has no effect and
fl_do_forms returning FL_EVENT is the correct behavior.
You can either turn off graphicsexpose event reporting
in the GC or handle this event as any other application
window evevt via FL_EVENT, fl_add_event_callback,
or fl_set_event_callback.
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