In that case, code expects an arrow gadget to be present but we're not
creating it in every occurrence.
Fix it by ensuring there will be an arrow gadget when reserve_indicator
is TRUE.
GtkViewport currently tries to draw a background over the bin window.
The feature is a bit broken at the moment, as it does not take into
account padding that might have been set on the GtkViewport, but in
general it does not seem very useful, and goes somewhat against the CSS
box model where every widget/gadget is responsible to draw its own
background. For a fix, we could either have the viewport gain a "bin"
gadget, or we could stop drawing the background.
As it isn't clear that there are any users of this feature, stop drawing
the background; a client can achieve the same effect by drawing the
background on the widget inside the viewport itself.
As GtkCssNode has the visibility concept, it makes sense to mirror it in
gadgets.
Do what visibility does in widgets: Hidden gadgets can't be drawn or
allocated and request a 0x0 size.
Note that just like widgets, gadget visibility must not be changed in
size request, allocate or draw handlers.
GtkWidget::child-visible has no equivalent yet, code will have to
emulate that manually.
Previously, the ID was only set on the CSS node as a side-effect
of calling gtk_widget_get_style_context. This was showing up
in CSS style tests as nodes lacking their IDs.
The test needs to be updated for the renamed :dnd pseudo class.
We also need to add a .errors file for the deprecation errors
that we are now producing.
Putting the deprecated class behind the official variant does
not work for the case of :focus and :focused - we were matching
:focus and leave a dangling 'ed'. So, put the deprecated classes
before the official variant, and explicitly mark them as deprecated.
Split the CSS docs off from the GtkCssProvider docs and
give them their own chapter. Among other things, this commit
introduces more or less complete definitions of the syntax for
the supported selectors, a complete list of all supported
properties, and definitions for their values. This includes
documentation for GTK+-specific properties such as -gtk-icon-source.
I hadn't noticed the :drop() pseudo state in the CSS4 Selectors
spec when I added this a while ago. This commit renames
GTK_STATE_FLAG_DND to GTK_STATE_FLAG_DROP_ACTIVE and adds
:drop(active) as equivalent to the :dnd pseudo state.
