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even when supersampling is not enabled, or we will get warnings about
out-of-range property values.

Still have to port script-fu scripts...

The invert-svg tool was never built so generating the Symbolic-Inverted
icons failed. Thanks Ell for the hint how to fix this.

Don't unconditionally overwrite all the proc's description, author
etc.  Instead, try to preserve them and append the "Deprecated" notes
to the help texts and generated comments.

Only affects one procedure because we killed the meta info of all
other deprecated procs so far, but now we don't have to do that any
longer.

Add new PDB group "drawable_edit" which has all procedures from the
"edit" group which are not cut/copy/paste.

The new group's procedures don't have opacity, paint_mode
etc. arguments but take them from the context instead. Unlike the old
gimp-edit-fill, gimp-drawable-edit-fill now uses the context's opacity
and paint_mode.

The new gimp-drawable-edit-gradient-fill procedure uses even more
context properties which are also newly added with this commit
(gradient_color_space, gradient_repeat_mode, gradient_reverse).

And some cleanup in context.pdb.

This is still WIP, nothing in the edit group is depcreated yet.

In particular, so that we use the correct element IDs, if we ever
extract the icons based on element ID.

This fixes the history of app/core/gimpdrawable-gradient.h, and
app/tools/gimpgradienttool{.c,-editor.{c,h}}.

Redo the part of commits b0beb019,
c3f98ccc,
6b0f5136,
and 3736bfd1, reverted by commit
e30a32d5.

Rename gimpblendtool{.c,-editor.{c,h}} to
gimpgradientool{.c,-editor.{c,h}}.  Note that this commit only
renames the files; the actual changes are done in the next commit,
so that git doesn't consider them new files.

Redo the part of commits 4f2e078c
and 5f6dfc76, reverted by commit
e30a32d5.

Rename gimpdrawable-blend.h to gimpdrawable-gradient.h.  Note that
this commit only renames the file; the actual changes are done in
the next commit, so that git doesn't consider this a new file.

Partially revert commits 4f2e078c
and b0beb019, since the changes
they introduced to some of the renamed files were big enough for
git to consider them entirely new files, hence we lost their
history.  The next few commits fix this.

This commit also partially or entirely undoes followup commits
5f6dfc76,
c3f98ccc,
6b0f5136,
and 3736bfd1, which will be
restored by the next few commits as well.

The upper text will be centered on the top quarter of the bottom quarter
of the splash image, whereas the bottom text will be centered on the
bottom quarter of the bottom quarter of the splash (unless the splash is
too small, in which case the double of the layout pixel extents will be
used). Basically don't use absolute pixel values anymore for
positionning. This should all be done relatively since there are
nowadays all kind of display size (and positionning the text 6 pixels to
the bottom, as it was done, may be ok on low density displays, yet will
look ugly on high density screens).

Also write this down in the splash requirements in the release howto so
that splash designers are aware that the bottom quarter of their image
will have to be adapted for printing text.

In GimpBrushTool, remember the settings used for the last cached
brush boundary, and avoid creating a new copy if the settings
didn't change.  This should lower the overhead of
gimp_brush_tool_flush_paint() when not using dynamics.

Also add a note about installing possibly from the release tarball or
from the package manager of a distribution, since apparently some assume
it has to be installed from repository, making their own life harder
that it has to!
Finally split the libmypaint and mypaint-brushes into their own numbers
to make things even clearer.

Which returns the entire GimpContainer of paint options.

Alpha is calculated separately, ne need to run it through babl.
Also some formatting cleanup.

Using CIE Lab yields gradients that more closely resemble the perceptual
gradients but without the gamma based blending problems of linear-RGB / CIE
XYZ.

Commit f5cb1fed, which performed
brush outline generation in GimpPaintTool in synchrony with the
paint thread, wasn't enough, since GimpSourceTool could still call
gimp_brush_tool_create_outline() directly during its
GimpDrawTool::draw() method, leading to the same race condition
when executed concurrently with the paint thread.

Partially revert the above commit, so that outline generation is
handled as before, as far as GimpPaintTool is concenered.  Instead,
add GimpPaintTool::{start,end,flush}_paint() virtual functions; the
first two are called when starting/ending painting using the paint
thread, while the third is called during the display-update
timeout, while the main thread and the paint thread are
synchronized.  This allows subclasses to perform non-thread-safe
actions while the threads are synchronized.

Override these functions in GimpBrushTool, and cache the brush
boundary in the flush() function.  Use the cached boundary in
gimp_brush_tool_create_outline() while painting, to avoid the above
race condition, both when this function is called through
GimpPaintTool, and through GimpSourceTool.

Commit b279c2d2 was breaking a specific use case, which I oversaw:
when space bar activates the move tool, you may want to release the
space bar while mouse button is pressed, and expect to still be able to
move the layer/selection/guide, but releasing space was stopping the
move immediately. The move tool must only be deactivated when both space
and button 1 are released, and the move itself must continue as long as
button 1 is pressed (when started while space was pressed).

As a nice side effect of this commit, panning and canvas rotation are
also improved since now they can be continued while releasing space
(respectively shift-space) if mouse button 1 was pressed, and up until
the mouse button is released. Pressing space again, then releasing the
mouse, back and forth, also work as expected (i.e. move tool stay
activated though the move stops; and panning or rotation continue).

Of course now we don't get anymore panning/rotation stuck while neither
space nor mouse buttons are pressed (which was the original bug). At
least one of these need to stay pressed for panning/rotation/move to
stay activated. And initial activation is obviously always through
(shift-)space only.

It makes more sense than "l" as a default, and "g" was currently unused.
So not much left to ponder.

This one string was still using the old name, which appeared in menus or
in the shortcut list.

This includes migrating properly any custom shortcut (menurc), as well
as a few strings in tool-presets/, and finally "gimp-blend-tool" in
contextrc and devicerc.
File toolrc also has some occurrences, but we are already skipping it
anyway, same as whatever is under tool-options/.
Hopefully I missed nothing.