Though the Color and Symbolic icon themes will have a different build
process and naming scheme for their icons, the base list is meant to be
the same by maintenance principle. So I am moving out the lists to the
icons/ directory's meson file.
Bumping meson requirement to 0.53.0 because I need to ability to use a
variable as dictionary key (not only string literals), which appeared in
this version. Meson 0.53.0 was released 2020-01-07 and seem to be used
in any stable distribution released since 2020. In any case, it seems
widespread enough to bump it now for our dev branch.
Some icons were missing on one side or another side, though mostly on
the meson build. Also the option -Dvec-icons=false was basically
completely broken and clearly untested, most likely ever since the
original meson build contribution.
This commit doesn't even completely fix the non-vector icon rule,
because even the file names are wrong, and the bitmap icons are not even
constructed from their vector counterpart! I am going to fix this in the
next commit.
The issue is that on X11, the window manager draws the title bar hence
uses the window-close button from the system theme, though on Wayland,
GTK draws its own decorations. Since we provide a window-close, we end
up with a disparity between this button and the minimize/maximize
buttons.
For now, let's just get rid of the window-close icon as an easy
solution, thus GIMP will always use the window-close icon from system
theme.
Maybe we can restore our own window-close icon later, but we should make
sure to at least have also window-maximize and window-minimize icons so
that the 3 buttons next to each others won't look too mismatched. And
probably we should also have smaller-size design because it doesn't look
so nice when huge (though it might simply have been the size mismatch
which gave this feeling).
Actually most of the build code was already there but the initial meson
contributor commented the Legacy icon theme out. Not sure why.
I only had to fix a few icon names, which changed into Freedesktop
standard names after commit 1e5cf10585. Other than this, existing meson
build rules seem to work fine AFAICS.
These icons are not available in any of our themes (Symbolic or Color).
Also they don't seem to be available in many icon themes either actually
and I'm not sure GIMP properly fallbacks to system icon theme when an
icon is missing in the selected theme anyway (I think to remember this
used to work, but it doesn't look like it works anymore).
Anyway I just copied the 2 symbolic switch on|off icons available in the
GTK+ repository at gtk/icons/scalable/status/. These are supposed to be
used by GtkSwitch but somehow they aren't. So for the time being, let's
bundle them directly with GIMP (until we figure something better out).
I put them in hicolor because this is the generic/default theme which is
always used as last resort and is common to any theme. It means any
specific theme will be able to override these icons, but if missing,
hicolor will be able to provide a fallback.
This is a quick and dirty fix to just deal with this specific issue, but
looking at meson rules for icons, it looks like I will need to do a
proper and very detailed review of this part of the build system.
Jehan