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(cherry picked from commit 5a077649)

Gah :)
(cherry picked from commit 49375a3d)

(cherry picked from commit baa8aadc)

Add devel-docs/performance-logs/performance-logs.md, which
describes how to record and view performance logs, and how to
report perofrmance-related issues.

(cherry picked from commit fa9161e4)

(cherry picked from commit 026fe766)

Nicknames on IRC/gitlab are hard, even more when they change depending
on the media! I realize we are regularly asking them or unsure of who to
contact (for instance here for releases). Let's associate each package
with its current maintainer to make it easy to contact the right person
to prepare our official packages before a release.

(cherry picked from commit dc9a3044)

(cherry picked from commit 96dc7da0)

Add a gimp-register-file-handler-priority procedure, which can be
used to set the priority of a file-handler procedure.  When more
than one file-handler procedure matches a file, the procedure with
the lowest priority is used; if more than one procedure has the
lowest priority, it is unspecified which one of them is used.  The
default priority of file-handler procedures is 0.

Add the necessary plumbing (plus some fixes) to the plug-in manager
to handle file-handler priorities.  In particular, use two
different lists for each type of file-handler procedures: one meant
for searching, and is sorted according to priority, and one meant
for display, and is sorted alphabetically.

(cherry picked from commit b4ac9568)

Including all user-visible link and links called from code, like
the help pages.

(cherry picked from commit bab75b73)

(cherry picked from commit 8eb77376)

As discussed on IRC with Mitch and Samm.
Older versions may work, and Samm says he will build for 10.9 actually,
but we officially only supports for 10.10.

Pass the current icon theme directory to plug-ins through the
config message, and add a gimp_icon_theme_dir() libgimp function
for retrieving it.  Note that we already have a similar
gimp_icon_get_theme_dir() PDB function, which we keep around, since
it can be used to dynamically query for the current icon dir,
unlike the former, and since it returns a dynamically-allocated
string, while the rest of the config-related functions return
statically allocated strings.

Use the new function, instead of gimp_get_icon_theme_dir(), in
gimp_ui_init().  This allows gimp_ui_init() to run without making
any PDB calls.  Consequently, this allows us to start plug-ins that
call gimp_ui_init() without entering the main loop in the main app.
We're going to add a plug-in that displays an interactive dialog
while the main app is blocking waiting for an operation to
complete, and we need to be able to start the plug-in without
entering the main loop, to avoid the possibility of arbitrary code
being executed during the wait.

Bump the protocol version.

GimpBusyBox is used to show a message indicating an operation is in
progress.  It's basically just a spinner and a label, with some
styling.

We're going to use it both in app/ and in a plug-in.

Also make so that the metadata URL is taken from the one of the package
set with configure.

(cherry picked from commit 6ebff7b3)

not just org.gimp.GIMP.appdata.xml.in

Explaining in the intro that the reference is the code, and where to
find it.
Rather than writing uint32/64 for every offset, use "pointer" as a
proper and well defined basic data type, whose detailed description is
in the "BASIC CONCEPTS" section at the start of the file.

... for layer modes.
KDE developers asked me where the code was so that they could reproduce
actual algorithms in their XCF reader. This is obviously interesting
information to have around in our docs.

Add some info about endianness (and the bug we had between version 7 and
11) and layer masks being attachable to layer groups now.

We should stop using MD5 sums altogether and push forward SHA256/SHA512
hash sums instead. The website is also being updated to display these in
favor of the deprecated MD5 sums.
We are most likely not going to remove previously computed MD5 sums, or
recompute SHA* hashes for older binaries, but at least we should stop
doing MD5 sums of any future binary.

Found via `codespell` and grep.

Found via `codespell`
Follow-up to  commit 7fdb963e

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.

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.

Step 1: rename the icon to GIMP_ICON_TOOL_GRADIENT (gimp-tool-gradient)

... for plug-in debugging as well.