GtkLayout and {h,v}adjustment->step_increment

[Stephen Bach <9sjb qlink queensu ca>]

Just a quick question.  The gtk_layout_size_allocate() function seems to set
the page_increment fields of its layout's GtkAdjustments, but not the
step_increment fields.

So in, say, gtk_set_hadjustment_values() and gtk_set_vadjustment_values()
(called in gtk_viewport_size_allocate()) of gtkviewport.c:
...
hadjustment->page_size = view_allocation.width;
hadjustment->step_increment = view_allocation.width * 0.1;
hadjustment->page_increment = view_allocation.width * 0.9;
hadjustment->lower = 0;
...
vadjustment->page_size = view_allocation.height;
vadjustment->step_increment = view_allocation.height * 0.1;
vadjustment->page_increment = view_allocation.height * 0.9;
vadjustment->lower = 0;
...

But in gtk_layout_size_allocate() of gtklayout.c:
...
layout->hadjustment->page_size = allocation->width;
layout->hadjustment->page_increment = allocation->width * 0.9;
layout->hadjustment->lower = 0;
...
layout->vadjustment->page_size = allocation->height;
layout->vadjustment->page_increment = allocation->height * 0.9;
layout->vadjustment->lower = 0;
...

This means that clicking the steppers in the scrollbars for the layout do
nothing.  In my program I've set step_increment manually by connecting to the
allocate signal of the layout, but I'm wondering what the reason is for the
missing functionality.

Thanks,

Stephen