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Static lib for tests

See merge request !3107

Link tests for private apis statically.

Rearrange our build to create a libgtk.a for the the contents of gtk/,
and build libgtk-4.so from our per-subdirectory static libraries.
This will let us link tests statically for testing internal apis.

Lsan leaks 2

See merge request !3106

We were putting the '\0' behind the end. Oops.

We don't use atk-bridge anymore, and we don't want
to see gio leaks.

Printing these out breaks TAP output, and we really
aren't interested in them.

asan pointed out that the array tests leak.

_gtk_gesture_cancel_sequence frees the struct pointed to by data,
so don't write to it afterwards. Found by asan.

Lsan leaks

See merge request !3104

testsuite: Stop requiring diff

See merge request !3103

Otherwise leaks could be missed.

Every program starts in __libc_start_main, so this would suppress
everything. This doesn't happen in practice because asan by default
is unable to unwind the stack. Setting
ASAN_OPTIONS=fast_unwind_on_malloc=0,malloc_context_size=15 can unwind
the stack, and if malloc_context_size is large enough it will indeed
suppress everything.

Unify the many copies of diff_with_file in one source
file, and patch it to detect diff at runtime and fall
back to a simple strcmp if we don't have it. Make all
tests use this new testutils.c, and stop requiring
diff for building the tests.

This should let us allow to build on Windows with the
default value for -Dbuild-tests.

Without this, kwin correctly assumes that we are
using client-side decorations. This is a port
of 32ae97f1 from GTK 3.24.

Fixes: #3609

Lazier accessibility

See merge request !3102

Inspector controllers

See merge request !3101

We only realize the ATContext on the top level, which will create an
GtkAtSpiRoot object and the corresponding GtkAtSpiCache object. Whenever
an AT connects to the accessibility bus, and asks for the various
objects, all the ATContext will be realized on demand.

If we're responding to a request to get all the cached items, there's no
need to emit signals when adding an ATContext to the cache.

Don't create widgets in bind, instead just set
the new action on the action-editor, and let it
recreate the parts that need to be recreated.

Prepare the action editor for being able to change its
actions after creation.

We are not using the size group anymore, so drop it.

Use a column view here.

Use a column view, and only show the widgets own
controllers.

Ebassi/for master

Closes #3607

See merge request !3100

Use a column view, and only show the widgets own
controllers.

If we cannot allocate memory, we cannot create any windowing system
surface. There's no coming back from that.

Fixes: #3607

docs: Update getting started section

Closes #3601

See merge request !3099

The vector-based variant should shadow the variadic arguments function
in bindings.

Let's hope people read them.

We were still talking about draw signals here,
which don't exist anymore.

Fixes: #3601

Redo arrow icons in various widgets

Closes #3577

See merge request !3097

Use the same approach as GtkTreeViewColumn for sort
indicators. Luckily, the same css works for both.

Instead of hardcoding icon names in the widget, use
arrow.none, arrow.up, arrow.down, arrow.left, arrow.right
styles and set the icon to use with -gtk-icon-source. This
lets themes change the icons that are used here, without
forcing all uses of pan-up/down/start/end-symbolic to be
treated the same.

Document this in the menubutton CSS docs.