There is no need to include gdkquartz.h there,
which was making it impossible to include this header file
without also adding gdk/ as an include directory when compiling.
This patch moves the include to the only location where it is actually needed.
In case of an offscreen window find its onscreen embedder, and NULL
any GdkWindowImpl that's not quartz, checking all return values.
This replaces 16ded683, removing its unnecessary search_for_nearest
functions.
Any unchecked cast of a GdkWindowImpl to GdkWindowImplQuartz risks at
least getting an invalid member reference, not just the ones in
gdk_quartz_window_get_foo, and all calls to gdk_quartz_window_get_foo need
to be checked, not just Gtk's internal calls. The motivation was that
transient_for was getting set on a Gimp offscreen window and that caused a
crash in raise_transient.
Some applications need to access gdk_quartz_window_get_nsview,
gdk_quartz_window_get_nswindow, and gdk_quartz_event_get_nsevent
so move these from the private gdkquartz-gtk-only.h to a new
header gdkquartz-cocoa-access.h. Don't include this header in
gdkquartz.h so that user code that doesn't need to access these
functins isn't required to compile with Objective C/C++.
Closes https://gitlab.gnome.org/GNOME/gtk/-/issues/1737
Closes: https://gitlab.gnome.org/GNOME/gtk/issues/1737
Don't export any functions taking or returning MacOS types in
gdkquartz.h, gdkprivate-quartz.h, or any header that either includes.
The GdkQuartz internal functions are moved to a new header
gdkinternal-quartz.h, the functions used by quartz-specific
Gtk files are moved to another new header gdkquartz-gtk-only.h, and
the key and event enums to a new header gdkkeys-quartz.h.
https://bugzilla.gnome.org/show_bug.cgi?id=784723 introduced support for
native file chooser dialogs on macOS, but due to the use of generics in
the patch, there will be compilation errors on pre-Xcode 7 platforms,
such as Mountain Lion and Mavericks.
I strongly recommend to revert this patch when the oldest supported
macOS release is bumped to Yosemite (10.10).
https://bugzilla.gnome.org/show_bug.cgi?id=785306
