The need of a specialised fixed layout container that can be placed into
a GtkScrolledWindow ceased to exist once GtkScrolledWindow gained the
ability to automatically interpose a GtkViewport when adding a child
that does not implement GtkScrollable.
All the other justifications that led to the existence of GtkLayout as a
separate widget from GtkFixed have been largely made irrelevant in the
20 years since its inception.
GtkLayoutChild instances are created on demand once we have a widget, a
GtkLayoutManager, and a child widget. This makes testing their creation
fairly tricky.
Let's skip them, for the time being.
Check that we get the expected sequences of focus
change events for the nonlinear, inferior and ancestor
cases.
It would be nice to do the same checks for crossing
events, but we have no gtk_window_set_hover().
Make the API expect a tranform of the proper category instead of
doing the check ourselves and returning TRUE/FALSE.
The benefit is that the mai use case is switch (transform->category)
statements and in those we know the category and don't need to check
TRUE/FALSE.
Using the wrong matrix will now cause a g_warning().
In particular, check that to_matrix() and to_2d(), to_affine() and
to_translate() return the same values.
This also requires a recent Graphene version or the tests will fail.
Make items-changed never emit 2 signals, instead, always emit only one,
potentially by extending the range reported in items-changed.
And be a lot more exhaustive about autoselect tests.
1. Do not make position an inout variable
The function is meant to return a range for a given position, not modify
a position. So it makes no conceptual sense to use an inout variable.
2. Pass the selected state as an out variable
Using a boolean return value - in particular in an interface full of
boolean return values - makes the return value intuitively feel like a
success/failure return. Using an out variable clarifies the usage.
3. Allow passing every position value
Define what happens when position >= list.n_items
4. Clarify the docs about how this function should behave
In particular, mention the case from point (3)
5. Add more tests
Again, (3) needs testing.
Ironically, these properties are too good - they always
give you a proper value, which is unfortunately different
from the declared default value, which is NULL. So, don't
check these.
Instead of adding them and waiting for the changed signal to be emitted
in the main loop, there might be a race where the change signal is
emitted before we have a chance of spinning the loop.
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.
