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Add a variant of gdk_drag_begin that takes the start position
in addition to the device. All backend implementation have been
updated to accept (and ignore) the new arguments.

Subsequent commits will make use of the data in some backends.

This makes the drag behavior under X11 match what we had previously.

This makes gdk_wayland_drag_context_get_dnd_window
backend-independent API and adds an implementation
for X11.

If the filter didn't return GDK_EVENT_TRANSLATE, the event struct would be
left unused and leaked.

This replaces all occurrences of 'explicitely' with 'explicitly'. Only
code comments and gtk-doc statements are affected.

https://bugzilla.gnome.org/show_bug.cgi?id=722429

If you set GDK_SCALE=2 in the environment then all windows will be
scaled by 2. Its not an ideal solution as it doesn't handle
multi-monitors at different scales, and only affects gtk apps.
But it is a good starting points and will help a lot on HiDPI
laptops.

The implementation is not working and unused, since XDND is the
de-facto standard under X nowadays.

https://bugzilla.gnome.org/show_bug.cgi?id=695476

Related: https://bugzilla.gnome.org/show_bug.cgi?id=664646

When the X server does not support the shape extension (as some
vnc implementations seem to), our DND code was always seeing
an empty input shape, so drops always missed their target.

http://bugzilla.gnome.org/show_bug.cgi?id=620240

gdk_x11_window_lookup_window() calls are done by this function alreayd,
so no need to do them manually.

No need to run sophisticated functions to guess it.

By making window caches refcounted. This fixes problems with leaking
drag contexts, as experienced in
https://bugzilla.gnome.org/show_bug.cgi?id=637691
and
https://bugzilla.gnome.org/show_bug.cgi?id=144324

Based on a patch by drago01@gmail.com

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>

Also rename all the macros etc.

These functions were essentially just calling setlocale anyway.
The X11 version was also setting a gdk_use_mb variable that
is not used anywhere.

Moving the direct-access redefinitions of various macros
to gdkprivate-x11.h and use that header throughout in x11/.

Also remove a workaround for a long-fixed X server bug.

The X11 backend exports a number of symbols which are _-prefixed
(so don't become part of the gdk api), but are not named in a
way to prevent accidental clashes between backends.

The one API change here is that the gdk_xid_table functions
have been removed - they did not server an purpose, since the
xid table only stores windows anyway, and we already have a
lookup-by-xid function for windows.

At the same time, make GDK_IS_DISPLAY_X11 available in gdkx.h, and
add some exemplaric ifdefs to GTK+ code.

At the same time, move some more class and instance structs
out of public headers.

Otherwise we run into warnings from xdnd_status_filter

Nonstatic backend-specific functions need an x11 in their name.

This commit hides GdkDragContext and GdkDragContextClass, adds
vfuncs for most drag context functionality, and turns the X11 DND
implementation into GdkDragContextX11. We also add vfuncs to
GdkDisplay for gdk_drag_get_protocol and to GdkWindow for
gdk_drag_begin, and implemenet them for X11.
Other backends need similar treatment and are broken now.

We don't want to expose depth anymore. If you need it, query the visual.

Use GDK_WINDOW_XID() instead.

THis was done using sed, so there might be issues resulting to that.
Feel free to fix.

GDK_WINDOW_XID() instead of GDK_DRAWABLE_XID()
GDK_WINDOW_XDISPLAY() instead of GDK_DRAWABLE_XDISPLAY()