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(cherry picked from commit d7de0781)

(cherry picked from commit 0fae4613)

(cherry picked from commit ca6f5774)

(cherry picked from commit 1d70fee1)

(cherry picked from commit d72e6b3a)

(cherry picked from commit 29b1d91b)

Found via `codespell -q 3 -S ./ChangeLog*,*.po -L als,ang,ba,chello,daa,doubleclick,foto,hist,iff,inport,klass,mut,nd,ower,paeth,params,pard,pevent,sinc,thru,tim,uint`

(cherry picked from commit a928452e)

... which compares two matrices.

Add gimp_matrix4_{identity,mult,transform_point}().

Add gimp_matrix2_{determinant,invert,transform_point}().

dbus-glib is no more a dependency since commit c4460e84, i.e. already
since 2013!

(cherry picked from commit 5f2a6940)

Though the description of the POINTER type clearly tells of the new type
size, it was still refered as 32-bit only in this introductory text.
Let's fix this.

(cherry picked from commit 35f55ef0)

Though it may have started as an unofficial document, it is clearly now
an official one (which should be obvious since it is in our source
repository, but apparently some people get misled by the historical
"Status" text to think this to be somehow unofficial).
So first of all, change the s/official/unofficial/ mention.

Secondly, add a small paragraph explicitly telling that the document is
complete (and meant to be), to the best of our knowledge. This document
is a detailed, full and exhaustive written "specification" of the XCF
format up to GIMP 2.10.x (even though the normative spec is still the
code itself). Now we are humans, we may have missed something, and if
so, this is just to be considered as any other bug, and reported to us
nicely to be fixed.

(cherry picked from commit 80e2e0a5)

(cherry picked from commit 30429e30)

(cherry picked from commit 4fefa445)

Add a "markers" page to the performance-log viewer, which lists
the event markers contained in the log, and allows navigating
between them.

Update docs accordingly.

(cherry picked from commit dafb63fd)

(cherry picked from commit 17270bb3)

In the perofmance-log viewer, add header-bar buttons to clear and
invert the selection, and allow inverting the selection by ctrl-
right-clicking on the sample-selection area.

Update the docs.

(cherry picked from commit b74c33db)

This commit completely removes the "Edit -> Fade..." feature,
because...

- The main reason is that "fade" requires us to keep two buffers,
  instead of one, for each fadeable undo step, doubling (or worse,
  since the extra buffer might have higher precision than the
  drawable) the space consumed by these steps.  This has notable
  impact when editing large images.  This overhead is incurred even
  when not actually using "fade", and since it seems to be very
  rarely used, this is too wasteful.

- "Fade" is broken in 2.10: when comitting a filter, we copy the
  cached parts of the result into the apply buffer.  However, the
  result cache sits after the mode node, while the apply buffer
  should contain the result of the filter *before* the mode node,
  which can lead to wrong results in the general case.

- The same behavior can be trivially achieved "manually", by
  duplicating the layer, editing the duplicate, and changing its
  opacity/mode.

- If we really want this feature, now that most filters are GEGL
  ops, it makes more sense to just add opacity/mode options to the
  filter tool, instead of having this be a separate step.

(cherry picked from commit ed7ea51f)

(cherry picked from commit 3e967ed0)

(cherry picked from commit b9de1076)

The NULL terminator of the tile-offset array of dummy buffer-levels
is erroneously written as an int32, instead of an offset, even in
version-11+ XCFs, in which offsets are 64-bit.

Since the dummy levels aren't actually used by GIMP, we're going to
keep these fields as int32 as an exception, in order to remain
consistent with existing XCFs, and just add a comment in the code,
and update the docs.  If we ever make use of the higher buffer
levels, we should change these fields to offsets, and bump the XCF
version.

(cherry picked from commit 2168d91c)

GimpSpinButton is a drop-in replacement for (and a subclass of)
GtkSpinButton.  Unlike GtkSpinButton, it avoids updating the
adjustment value when losing focus, unless the entry text has
changed.  This prevents accidental loss of precision, when the
adjustment value can't be accurately displayed in the entry.

Note that libgimpwidgets already defines a (deprecated)
gimp_spin_button_new() function.  This commit stays compatible with
the old function, by defining GimpSpinButton's _new() function as
gimp_spin_button_new_(), and defining a variadic
gimp_spin_button_new() macro, which expands to either the old or
the new function, based on the number of arguments, so that either
function can be used transparently as gimp_spin_button_new().  This
is all gone in master.

:P

(cherry picked from commit 66263604)

(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.