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Update the gtk.doap file

See merge request !3088

Add relevant people as maintainers.

GDK/Win32: Remove layered windows usage

See merge request !2782

In GTK4, we are now defaulting to the OpenGL renderer with the Cairo renderer
only used as a fallback, so there is no point keeping the code paths that use
layered windows as layered windows do not work well with OpenGL nor Vulkan.

Matthiasc/for master

Closes #3437

See merge request !3087

When GtkAboutDialog was changed to derive from
GtkWindow, it lost the initial focus handling that
GtkDialog has. Reinstate some of it.

Fixes: #3437

Avoid a critical when closing the inspector with the
recorder page open.

Wip/baedert/for master

Closes #3593

See merge request !3086

Fixes #3593

Surface scale

Closes #3578

See merge request !3085

And this way the contains_rect() inside
rounded_inner_rect_contains_rect() goes from 3.3% to 0.79% in the
fishbowl when rendering the levelbars.

The pointers passed to GtkWidgetClass::measure cannot be NULL

Make this function shorter, the parameters non-nullable and the simple
cases more explicit.

This only happens in error cases so not very interesting. Anyway, try to
make scan-build happy.

We get up to 370 of these when starting the widget-factory.

Unref the acessible values

Out of the 3.3k possibly_finish_subparser calls when opening the
widget-factory, only 300 need one.

docs: Add details

See merge request !3084

Emit property notification when the surface scale
changes.

When the width, height or scale of a surface changes,
emit property change notification.

Connect to change notification for the surface
scale-factor property, and update the widgets
when it changes.

Fixes: #3578

This will allow us to notify when the scale changes.

Explain the difference between GtkPicture and GtkImage,
and when you might want to use which.

inspector: Add a legend for the layout overlay

See merge request !3083

Those don't exist anymore.

Colors are more useful if you know what they represent.

overlaylayout: Set the child type in the class

See merge request !3082

We don't need to override create_layout_child here,
and setting the child type has the advantage that
the layout properties are showing up in the inspector.

Flip margin-start and -end in RTL

Closes #3583

See merge request !3081

Test that a horizontal box changes the order of its
children in RTL, and that widget margins flip start
and end.

This tests the fix in d89ff718.