Layout managers needs a way to store properties that control the layout
policy of a widget; typically, we used to store these in GtkContainer's
child properties, but since GtkLayoutManager is decoupled from the
actual container widget, we need a separate storage. Additionally, child
properties have their own downsides, like requiring a separate, global
GParamSpecPool storage, and additional lookup API.
GtkLayoutChild is a simple GObject class, which means you can introspect
and document it as you would any other type.
We can use a constructor property for existing container widgets with
a layout policy, and move the layout policy implementation out of the
widget itself and into a LayoutManager subclass.
We delegate the size request mode, the measuring, and the allocation of
a widget through a GtkLayoutManager instance, if one has been attached
to the widget; otherwise, we fall back to the widget's own implementation.
A base abstract class for layout manager delegate objects.
Layout managers are associated to a single widget, like event
controllers, and are responsible for measuring and allocating the
children of the widget they are bound to.
Change the reorder api to insert after a sibling,
so that moving to first place becomes reorder (... NULL).
And add a insert_after api that can replace the common
container_add / reorder_after (... NULL) combination.
Update all callers.
The position child property is problematic, since it
requires us to emit notification for all children when
inserting a child early in the list of children.
Remove the property from all ui files.
GtkWidget saves a widget list for us, so we don't need to keep track of
them ourselves. This is okay now that we don't have a pack-type child
property anymore.
Some of the flags got lost in the meson transition or were demoted from
error flags to warning flags.
This commit reintroduces them.
It also includes fixes for the code that had warnings with those flags.
The big one being -Wshadow.
Remove the unneeded is_platform() check and just go by extension point
priority.
Also g_error() out if no im module exists, because "simple" is compiled
in and should always exist.
All built-in backend modules get a priority of 0 because they are the
default ones.
GtkIMContextSimple gets a priority of G_MININT because it's the fallback
one.
This mirrors the media modules code.
The format of the printout will be suitable for addition as a new test to
testsuite/gtk/rbtree-crash.c
by just grepping the printouts from the relevant rbtree.
We need to tell the portal what filter is supposed to be selected by
default, or it will just pick the first one, which could be wrong and
annoying.
This will require updated xdg-desktop-portal and xdg-desktop-portal-gtk
to work properly.
Fixes#1492
