Replace checking if the NSView is really a GdkWindow, which will crash
in the likely event it's not a GObject, with ensuring that the parent
GdkWindow is really a GdkWindowQuartz.
This was added a few years ago, as a way to have _no_ im context
at all. But it didn't actually work. Make it work, and streamline
the handling of none by moving it all to gtkimmodule.c.
As part of this, add context to the translated names of all
im modules we ship.
Commits the pre-edit string on receipt of focus_out and reset
commands.
Patch refinements by Cody Russell <bratsche@gnome.org> and
Ek Kato <ek.kato@gmail.com>
When an application translates a key event and drop its native event
before passing to imquartz, it can't recognize the NSEvent. On this
case imquartz doesn't emit any signals such as "commit" signal so
that the application doesn't insert any text. To avoid no response,
at least imquartz should fallback to slave GtkIMContextSimple.
https://bugzilla.gnome.org/show_bug.cgi?id=694273#c27
(cherry picked from commit c064e18894)
