Link libgtk to libintl

See merge request GNOME/gtk!113

Resolve "GtkTextView accesses already disposed object"

Closes #169

See merge request GNOME/gtk!109

gdk: do not deactivate surface on keyboard grab

Closes #85

See merge request GNOME/gtk!120

When pressing e.g. a window manager shortcut, which acquires keyboard grab,
Xorg would send FocusOut NotifyGrab then FocusIn NotifyUngrab.  Currently
gdk would then deactivate the current surface, which makes accessibility
screen readers think that we have switched to a non-accessible application
and came back again, and thus reannounce the application frame etc. which we
don't want when e.g. just raising volume.

And actually, receiving FocusOut NotifyGrab does not mean losing the
X focus, it only means an application aqcuired a grab, i.e. it is
temporarily stealing keyboard events. On Wayland, this isn't even
notified actually.

This commit makes gdk only deactivate surfaces when there was an actual
focus switch to another window, as determined by has_focus_window (instead
of just has_focus), which happens either normally through FocusOut with
NotifyNormal, or during grabs through FocusOut with NotifyWhileGrabbed.

Fixes #85

Close some gaps in gdk docs.

If only the errors would make it back to stderr.

GdkDrawingContext no longer exists.

Also remove gdk_drag_context_set_device() and insist on backends using
the property.

Instead of creating and reusing the same one from start to finish.

Otherwise buttons don't work as drag sources, and we like to do that.

When changing the widget type, don't start out with 0 icons.

gdk_win32_keymap_check_compose() shouldn't be called for
non-W32 displays (i.e. when using broadway or other backends
that could be made to run on Windows).

Adrian Johnson authored Apr 12, 2018 and Marek Kašík committed Apr 26, 2018

to retreive paper size specific hard margins and use this
to set the hard margins in the print context.
(modified by Marek Kasik <mkasik@redhat.com>)

https://bugzilla.gnome.org/show_bug.cgi?id=686109

The function hooked up to the ::key-pressed signal should have
a return value. Pointed out by Peter Bloomfield.

What you don't find when laughing at vcpkg having a CMake build file for
GTK.

gtk_get_current_event() returns a new reference to the event, it should
be freed across various return branches to avoid the event leak, or we
just fetch the little stuff we're interested in.

Prevents keybindings from working on scales.

Prevents combobox menus from being closed.

Now that all Cairo contexts are ported to managing cairo surfaces
themselves, the old fallback code that didi the managing is no longer
needed.

Also clarify the behavior of gdk_cairo_context_cairo_create() wrt the
vfunc by doing the early exit and the clipping outside of it.

* Remove DC refcounting (we trust GDK to always do
  begin_frame/end_frame calls in pairs)
* Now that there's no GDK-provided double-buffer up the stack,
  double-buffering is implemented here
  (though it's disabled by default - in my tests it didn't provide
   any visual improvements, but did decrease performance).
* For some reason delaying window resizes until the point where
  we need to blit the double-buffer into the window leads
  to visual glitches, so doulbe-buffered windows are resized
  in begin_frame, same as non-double-buffered ones.
* New code to clear the paint region, for all drawing modes.
  Hopefully, it isn't duplicated anywhere up the stack.
* GL has its own context now, so remove any GL-related comments.
* Layered windows are still used (because cairo actually works
  better with them)
* A bit more code re-use for layered windows
* Some functions that were local to gdksurface-win32.c are made
  usable for the whole backend
* Drag-indicator drawing is temporarily commented out to match
  a similar change in X11 backend

We used to pass 2 regions to GdkDrawCotnext.end_frame() but code was
confusing what they meant. So we now don't do that anymore and only pass
the region that matters: The frame region.

This makes the previous gdk_draw_context_is_drawing() function public
under a new name.

I decided against the old name because we use the term "frame" for a
drawing operation, so I wanted to have this boolean flag reuse the term.

... and get rid of duplicate variable in the process.

As they require a draw context and the draw context is already bound to
the surface, it makes much more sense and reduces abiguity by moving
these APIs to the draw context.

As a side effect, we simplify GdkSurface APIs to a point where
GdkSurface now does not concern itself with drawing anymore at all,
apart from being the object that creates draw contexts.

All information is kept in GdkDrawContext these days, so use that one.

Use the identical gdk_draw_context_get_frame_region() instead.

This does the same as gdk_drawing_context_get_clip().