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Basically if you enabled OpenCL or any of the experimental tools, it
will show the Playground in Preferences. Otherwise, say you enabled some
experimental feature months ago (e.g. with the CLI option) and you now
experience crashes or whatnot. And you forgot how to change it, and only
remembered that there was something in Preferences. It would make you
crazy to not find the tab again to disable the option.

This is even more important as OpenCL is moving from a normal option to
a playground option. So you might not even have ever seen the Playground
tab in Preferences and would not know how to disable OpenCL after you
enabled it originally in "System Resources" tab.

So now Playground is visible with any of these 3 conditions:
* If you use an unstable version.
* If you run GIMP with --show-playground option.
* If you previously enabled one of the playground options.

(cherry picked from commit d3ef6cfb)

After discussions on IRC, it was decided that our current level of
support of OpenCL was not good enough. As a normal settings, people just
see it as a normal acceleration checkbox, even despite the warning text
and emoticone saying the opposite (i.e. it may even slow things down in
some cases).
Basically this feature needs more love to be back into mainstream
Preferences.

(cherry picked from commit 0f806d0e)

This file is available in a flatpak sandbox and will contain various
info such as the build commit, very useful info as we can have several
builds for a same version. For instance if we have exactly the right
commit, we can load exactly the same binary as a bug reporter very
easily, hence are able to get source correspondance without necessarily
asking reporters to install debug symbols (though it stays easier if
they can do it).

Other interesting info contained in this file are the exact runtime
used, the installed application or runtime extensions, the permissions
(people may override our flatpak permissions so it's useful to be able
to check when they did) and environment variables…

(cherry picked from commit bc5f6371)

(cherry picked from commit 0a611bd8)

In GimpSpinButton, don't propagate Enter key-press events if
updating the spin-button's value in response changes the entered
text.  This prevents confirming dialogs when hitting Enter after
entering a math expression in size entries, updating their value
instead.

Likewise, don't propagate Escape key-press events if a new value
was entered, and restore the original value instead.

(cherry picked from commit e5310230)

Even though this engine is optional, we already have the code to detect
its absence at runtime, and to fallback to "gegl:matting-global". So it
won't be a problem even then.

When the operation is present though, it definitely makes a lot more
sense than matting global as default, because it performs a lot better
in most cases (as far as I could see as well as others).

(cherry picked from commit b52cdf4c)

In GimpToolButton, when in "show menu on hover" mode, increase the
idle priority for hiding the the tool-group menu upon button/menu
leave-notify.  Make the priority one step below the normal event
priority, so that a subsequent button/menu enter-notify event
canceling the idle is processed beforehand, while the idle is
otherwise still processed before ordinary lower-priority sources,
in particular, before projection rendering timeouts.

In file-tiff, add an option to crop the layers to the image bounds
when exporting individual layers (using GIMP_EXPORT_NEEDS_CROP
added in the previous commit), since TIFF has no concept of global
image bounds otherwise.  Cropping is enabled by default.

Add a new GIMP_EXPORT_NEEDS_CROP export capability, which causes
gimp_export_image() to crop the exported image content to the image
bounds; this is useful for formats that support layers, but have no
concept of global image bounds, hence cropping is the only way to
enforce the image bounds.

When showing the export dialog, give an option to either crop the
layers to the image bounds, or to resize the image to fit the
layers.

When exporting a TIFF file without merging the image, make sure non
of the exported layers has a negative offset, by offsetting all the
layers as necessary.  TIFF doesn't support negative page offsets,
giving an error in libtiff.

(cherry picked from commit 46cb5a5e)

When loading a TIFF file with signed-int samples, convert the
samples to unsigned-int by offsetting them to the unsigned range,
instead of misinterpreting them as unsigned values.

(cherry picked from commit 8b981933)

In gimp_tool_button_enter_notify(), only mask-in the mouse-button
state for determining whether to show the tool-group menu.  This
avoids other bits of state -- in particular, certain keyboard
locks, including keyboard-layout state -- from preventing the menu
from showing.

gimp_histogram() takes an inclusive range -- the plug-in has been
counting non-zero pixels twice.

(cherry picked from commit 6a01bf2d)

In psd-save.c, fix erroneous call to gimp_item_get_image(), which
was being called with an image-id, instead of a drawable-id,
potentially causing an error or wrong results if the image-id did
not correspond to an existing item, or if the corresponding item
did not belong to the exported image.

(cherry picked from commit 437bcf77df194b238126fe1c0b24c92b26a15442)

(cherry picked from commit 0ce3798a)

Clean up faint pixels in the "Acrylic 05" brush, which produce a
badly-thresholded mask with the Pencil tool.  See issue #5180.

Thanks to Sevenix for the fixed brush!

(cherry picked from commit f9cc239f)

Fix horizontal downscaling of brush mipmap levels with odd width.
We'd previously fail to skip the last pixel of each input row,
which isn't included in the output when the width is odd, causing
subsequent output rows to be shifted to the right.

(cherry picked from commit c4a201ea)

(cherry picked from commit bbc0f189)

(cherry picked from commit 5c07bcd1)