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... it's no longer needed, since GEGL commit
gegl@9dcd2cde.

Partially reverts commits:

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Add a Babl space parameter to gimp_gegl_color_new() and all utility
functions using it. Pass NULL if the GimpRGB actually is sRGB, pass
the image's layer space if the color was already converted using
gimp_pickable_srgb_to_image_color() or similar.

... edges for MyPaint brush.

Adding the concept of "stateful" symmetry when a tool needs to make sure
of corresponding stroke numbers and orders while painting (i.e. stroke N
at time T+1 is the continuation of stroke N at time T). This is the case
for the MyPaint brushes and the ink tool.

... on perceptual gamma image

When constructing the paint core's paint buffer, in GimpBrushCore
and GimpInk, use the drawable's format as the preferred format in
the call to gimp_layer_mode_get_format(), instead of NULL.

Subsequently, use the paint buffer's format, instead of the source
buffer's format, as the preferred iterator format in
do_layer_blend(), since the iterator format must match the paint
buffer format.

Instead, add a gimp_layer_mode_get_format() function, which takes
the layer mode, composite space, and blend space, and returns the
I/O format.

Currently, we always use the composite space format as the I/O
format.  This simplifies gimp_composite_blend(), and gives us
composite-space support for the "special" layer mode ops for free.

and to operations/layer-modes/, respectively.

Add gimp_layer_modes_init() which asserts on the correct order of the
GimpLayerModeInfo array, and switch to accessing the array directly in
gimp_layer_mode_info().

by creating temp buffers matching the format needed by the
GimpLayerMode's process_pixels() function.

Color manage colors applied when painting, and when filling, merging,
resizing and transforming drawables.

You can now set any paint tool to mirror painting relatively
horizontal/vertical axis or a central point (any combination of these 3
symmetries).
This has been implemented as a new multi-stroke core, where every stroke
is actually handled as a multi-stroke (default of size 1).
This is also the first usage of custom guides for symmetry guiding.
Current version has to be activated in the playground.

Now the history of recently used colors is not updated when selecting
in the color dialog anymore, but when a color is actually used.
Tools supported right now are: Ink, MyPaint brush, all PaintBrush tools,
bucket fill and eraser (background color on non-alpha drawables).
Moreover from now on, colors already saved are properly moved to first
position when reused.

- don't include <gdk-pixbuf/gdk-pixbuf.h> in headers in app/
- instead, include it in many .c files instead of <glib-object.h>,
  finally acknowledging the fact that app/ depends on gdk-pixbuf almost
  globally
- fix up includes as if libgimpbase depended in GIO, which it soon will

Directly access the brush and paint buffers rather than using
GEGL iterators.

Replicate the relevant parts of GimpApplicator using direct
access.

instead of the drawable's native format plus alpha, because we access
these buffers as RGBA float later.

and forget about include policy in base/, it's scheduled for removal
anyway.

and remove the "take_ownership" parameter from
gimp_temp_buf_create_buffer(), simply always ref the buf.

Fix the places that passed the color by either temp_buf_data_clear()
or memset(), and assign x and y manually, they are going to vanish
completely soon.

Defining GeglRectangle inline is so useful that it has been added to
GEGL.

and get rid of some more intermediate buffer creation/destruction, and
some redundant temp_buf_free() plus g_object_unref().

and remove the public TempBuf based get_paint_area() API.

which is the same as gimp_paint_core_get_paint_area() but returns a
GeglBuffer to paint to, not a TempBuf.

because that's what it's called in public API. This has confused me
long enough now.

and use gimp_context_get_foreground,background_pixel() instead.

and remove explicit alpha setting in the returned array in most places.