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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.

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.

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…

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.

By adding support for multiple selected layers, it seems I broke the
single selected layer case. Fixed now!

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).

Fixes #5261.

Poppler has not been an optional dependency for years now, because it
was decided that PDF import was considered a granted feature by most
people. So removing the option in the meson build. This option should
not have existed in the first place.

No need "See Also: gimp_drawable_get_shadow_buffer()" from within
gimp_drawable_get_shadow_buffer() documentation itself!

If the next visible layer below a selected layer is itself selected, we
want to create bigger merge list with all 3 layers merged at once (or
even more if the next-next is also selected, and so on).

When several layers are selected, each layer will merge down with the
layer below it. This is similar to running Merge Down several times, one
for each selected layer.

The list of selected layers may be empty, which doesn't matter much
because we don't actually do much with this list in current export code.
In the code modified in this commit, we were only using existing layers
to set the type of a new layer (which seems very useless right now as
anyway the layer type has to be the image base type with or without
alpha, so a with_alpha boolean parameter would be just as good, unless
we plan to support different color model layers in a same image).

This seems to have been broken since much longer, but it only made a
problem with recent changes. Since we were duplicating layer groups and
contents layers at once, the current code could not keep layer selection
other than at root level in a duplicated image.
Use the layer paths to make sure we select exactly the right copied
layers, since the path should not change in a fully duplicated image.

It just says "The GIMP team" so it's kind of redundant/useless, but I
noticed that Flathub would just display an empty "Developer" section
because the tag is absent. Well at least it emphasizes the
community-developed side of GIMP.

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.