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Emit ChildrenChanged signal on hierarchy updates

See merge request !2752

Implement accessible attributes for ui files

See merge request !2751

Wip/otte/for master

Closes #3295

See merge request !2748

Gstreamer suggests doing that.

https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/issues/1439

Fixes #3295

Adwaita: dropdown search box

See merge request !2747

- have some whitespace around entry

Partial fix for #3291

Matthiasc/for master

See merge request !2746

popovermenu: Allow custom items

Closes #3260

See merge request !2728

GTK does this automatically based on mnemonics, but only
if the string actually contains a mnemonic. This makes
orca read out menuitems, as expected.

This tests the custom menuitem support, and lets you
control the transition duration for the main stack.

Support <child type="ID"> to fill custom child slots
in both GtkPopoverMenus and GtkPopoverMenuBars that
are created in ui files.

Add a way to add children at certain places in
the generated menu for both GtkPopoverMenu and
GtkPopoverMenuBar.

New apis:
gtk_popover_menu_add_child
gtk_popover_menu_remove_child
gtk_popover_menu_bar_add_child
gtk_popover_menu_bar_remove_child

Fixes: #3260

Fix the build with cups < 2.2.12

Closes #2968

See merge request !2744

PPD_CUSTOM_UNKNOWN was introduced in cups 2.3.
and has been backported to 2.2.12.
Only handle it when we build against a new enough cups.

Fixes: #2968

This makes it so that you have to explicitly specify
"true" and "false" for the checked state, but it
matches how this enumeration is meant to be used.

Matthiasc/for master

See merge request !2741

To make this possible enable the doc shooter
to take screenshots of popovers.

Show the new palette.

Now that the volume button image is small, move it
to a better place in its section. Improves the layout.

Give up on showing the popup, we don't do that
for other buttons either.

It has been missing far too long.

Improve the breaks in the container section.

Makes it fit better with the other entries.

Align things better.

Make the GtkPicture gallery image stay within its
limits, by overpowering its request mode.

Move GtkSpinButton to the entries, where it
belongs, despite its name.

It turns out gtk-doc can't even parse its own custom
links if you don't arrange for the <link> element to
on a single line, since it is just a glorified sed
script :(