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This allows to just 'enter' to accept, but clicking on the
screen_cast_widget anyways, will make it useless, maybe
something could be done in the code

Currently, there is no way to close the dialog without
using mouse, this allows it to close using Escape key

Wraps are easier to work with than Git submodules and Meson has built-in
support for them.

And, as a fallback, a subproject as well.

Will be used by submodules and libadwaita.

Otherwise it breaks the accessibility handling, and doesn't actually
make the screenshot dialog transient to the foreign parent.

This is a massive, drop-the-bomb change. The main highlights of
the changes are:

 * 'gnome-desktop' dependency is dropped in favour of copying a
   couple of files (gnome-bg.*, gnome-bg-slide-show.*) and porting
   them to GTK4.

 * Most of the changes to UI files are generated by gtk4-builder-tool,
   and manually adjusted after running it.

 * GdkWindow → GdkSurface

 * Manually call Xlib functions to set the foreign window transient
   parent, since GTK4 doesn't have foreign windows anymore.

A fallout from the meson port.

We need to manually prepend the installation prefix.

Only the bare minimum: build the project.

Adios

Meson is modern, Meson is good. Let's go Meson.

Closes https://gitlab.gnome.org/feaneron/xdg-desktop-portal-gnome/-/issues/2

Trivia

See merge request feaneron/xdg-desktop-portal-gnome!1

Fallout from the initial commit.

Copied from xdg-desktop-portal-gtk and stripped out of
everything not strictly GNOME specific.