[Gegl-developer] Notice (especially for third-party packagers) about the "Symbolic" and "Symbolic-Inverted" icons

[Jehan Pagès <jehan marmottard gmail com>]

Hello all,

If you are a third party packager, or a user who builds GIMP yourself,
and happen to have an issue where the Symbolic and Symbolic-Inverted
icons are nearly the same color, you can simply run on your GIMP tree:

$ touch icons/Symbolic/*/*.png

Note that if you are a packager in particular, an even better practice
is to always build from scratch when the goal is to provide a software
package to users. This way, you avoid build bugs, like this one.

For information, the problem is because of a bug on gegl:invert-linear
operation, which — for some reason still unknown (see bug
https://bugzilla.gnome.org/show_bug.cgi?id=760766) — was not properly
inverting colors on many icons. This issue has been bypassed with
commit 37a482a:
https://git.gnome.org/browse/gimp/commit/?id=37a482a09609d54fed91b56fb1bec39d08d052dc

If you happened to have built GIMP in between the icon color switch
and this commit, and never cleaned your repository, then you will
encounter the problem. The solution is therefore touching all origin
png icons (or a `make clean`).
Have fun with GIMP!

Jehan

P.S.: but really, if you are a packager, not building from scratch is
bad practice. You are building for many people and should do it from a
clean slate.