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Now that we have a two-stages GL context creation sequence, we can move
the profile to a pre-realize option, like the debug and forward
compatibility bits, or the GL version to use.

Instead of LEGACY.

Move egl_context initialization in gdk_gl_context_realize

 • gdk_window_create_gl_context() creates a GdkGLContext
 • gdk_gl_context_realize() creates the underlying resources

https://bugzilla.gnome.org/show_bug.cgi?id=741946

We should remove the mir and cairo surface before rendering the
transient_for, which will regenerate the cairo surface anyways.
Otherwise, we end up releasing both, when we only really want to get rid
of the mir surface.

Some child window behaviour is faked by painting in the parent, so we
don't bother creating the Mir surface in that case.

Mouse over a parent menu[bar] didn't work while the menu was open.
The fix was to correct the behaviour of pointer crossing events so that
the pointer appears to be only inside one window at a time.

See: http://tronche.com/gui/x/xlib/events/window-entry-exit/normal.html

Without this, we generate incorrect crossing events for transient
windows.

It's unused. At the same time, rename "begin_paint_region" to
"begin_paint". This will help us clean up how GDK painting works
in the future to allow more creative use of double-buffering.

Implement GdkGLContext using EGL and use hardware mir surfaces
when a GdkWindow uses gl rendering.

Fixes https://bugzilla.gnome.org/show_bug.cgi?id=740346

Store the cursor name on the cursor (rather than always using its type).

Use this when setting a cursor on a surface.

The mir server will fallback to using standard cursors from the cursor
theme if the name used is not one of those defined by mir, which is more
or less what we want to happen here in case of creating a cursor by
name.

This is disabled by default.  Enable with --enable-mir-backend.

This backend is a combined work of Robert Ancell and Ryan Lortie.