build: Add missing sources for the GdkX11 gir build

See merge request GNOME/gtk!689

build: Include all generated sources for the gdk gir build

See merge request GNOME/gtk!688

flowbox: children per line may not be 0

See merge request GNOME/gtk!687

Noticed while diffing .gir files with the meson port.

The main one is gdkversionmacros.h which resulted in
GDK_MAJOR_VERSION, GDK_MINOR_VERSION and GDK_MICRO_VERSION not being included
in the Gdk-3.0.gir.

Noticed while diffing girs with the meson port.

flowbox: check for flowbox when updating selection

See merge request GNOME/gtk!686

Portal session state

See merge request GNOME/gtk!519

This lets us take just-in-time inhibitors, and makes
the session support a little more real.

React to the session-state in StateChanged signals from
the inhibit portal and call QueryEndResponse as appropriate.

themes: Optimize code for marks margins on scales

See merge request GNOME/gtk!612

Fix some translation domains in .ui files copied from gtk4

See merge request GNOME/gtk!683

build: Fix fribidi version reqs in Requires.private

See merge request GNOME/gtk!685

This resulted in "fribidi_required_dep" being written to the .pc file
instead of the version number.

gtk40->gtk30

list image buttons

See merge request GNOME/gtk!656

Quartz GLArea

See merge request GNOME/gtk!146

The previous version of this patch sent an update message to the
NSOpenGLContext in a GdkGLContext::update vfunc, but that vfunc does not
exist any more.

See: #517

Current problems:
* other widgets in a GL-painted window are low-resolution on Retina
  display
* something wrong with paint updates; gdkgears demo only updates every
  couple of seconds but reports ~30fps

See: #517

Use GLSL 3.30 shaders

See merge request GNOME/gtk!671

We currently ask for anything above 3.2 GL contexts, but we're still
using GLSL 1.50 shaders all over the place. If a GL driver supports GL
3.2+ and GLSL 1.50 only then we'd be in trouble, but the chances of that
happening are really small.

Fix the introspection build with "-Wl,--as-needed -flto -O2". Fixes #1692

See merge request GNOME/gtk!665

They're either wrong (when using FALSE because the widgets don't account
for changes to the CSS) or unnecessary (when using TRUE because it's the
default).

Fixes !1777

Thats a valid way to end color picking.

- based on Tobias' and Allan's feedback, the app icon dropshadow
  were too prominent.

The above flags in combination with "-fvisibility=hidden" break the
g-i build because it results in the g-i generated dumper executable not
linking against the libraries because they are detected as unused and
thrown out.

Fix by only using -fvisibility=hidden for the library and not g-i.

Inspector: Find themes the same way GtkCSSProvider does

See merge request GNOME/gtk!663

Look for subdirectories named "gtk-3.x", where 'x' starts as current
minor version and counts down to 14, then drops to 0.
Only look for gtk.css in these directories though. If a theme only
provides gtk-dark.css, it won't be found.

GDK W32: Test for IME correctly

See merge request GNOME/gtk!658

The strings that are set are static, so g_value_set_static_string() should
be used to set them instead of g_value_set_string().

ImmIsIME() doesn't work (always returns TRUE) since Vista.
Use ITfActiveLanguageProfileNotifySink to detect TSF changes,
which are equal to IME changes for us.

Also make sure that IMMultiContext re-loads the IM when keyboard layout
changes, otherwise there's a subtle bug that could happen:
* Run GTK application with non-IME layout (US, for example)
* Focus on an editable widget (GtkEntry, for example)
* IM Context is initialized to use the simple IM
* Switch to an IME layout (such as Korean)
* Start typing
* Since IME module is not loaded yet, keypresses are handled
  by a default MS IME handler
* Once IME commits a character, GDK will get a WM_KEYDOWN,
  which will trigger a GdkKeyEvent, which will be handled by
  an event filter in IM Context, which will finally re-evaluate
  its status and load IME, and only after that GTK will get
  to handle IME by itself - but by that point input would
  already be broken.
To avoid this we can emit a dummy event (with Void keyval),
which will cause IM Context to load the appropriate module
immediately.

1. NSRect and CGRect aren't toll-free bridged in 32 bit builds.
2. NSWindowCollectionBehavior(Dis)AllowTiling is defined beginning in 10.11.

Adwaita: checked buttons workaround

See merge request GNOME/gtk!657