… gimprc's manpage as a consequence.
When running `gimp-console-2.99 --dump-gimprc-manpage` to output a man,
a line was:
> .TH GIMPRC 5 "Version @GIMP_VERSION@" "GIMP Manual Pages"
This is clearly the autotools substitution syntax, which is not being
used here (this is not a .in file processed by the build system), maybe
from some older build logics.
Some gimprc properties' default values depend on the machine where
"make dist" in run. We had an ugly hack in place to force
(num-processors 1) in the installed system gimprc and its manpage, but
were still leaking "tile-cache-size" and "mypaint-brush-path".
The files are generated by the hidden options --dump-gimprc-system
and --dump-gimprc-manpage which exist only for this purpose.
In gimpconfig-dump.c, special case the three properties in
dump_gimprc_system() and dump_gimprc_manpage() to output constant
default values for "num-processors" and "tile-cache-size" and
output @mypaint_brushes_dir@ in "mypaint-brush-path" which can
be replaced at configure time.
Also introduce etc/gimprc.in so @mypaint_brushes_dir@ can actually be
substituted for the installed system gimprc.
This was hard-coded to what I guess was a personal prefix (commit
368c7c0511), which is obviously wrong. This has to be constructed at
compilation and the man must mirror whatever is the actual installation
path of mypaint-brushes package.
Since we have many themes now, this new name better indicates that it
is meant to follow your desktop theme settings.
Also it will likely not remain the default theme.
It's now either $XDG_CONFIG_HOME/$gimpdir/2.9 or directly $gimpdir,
depending on whether $gimpdir is a relative or absolute path. Build
the resulting string in configure and put it into the manpage_gimprc
variable so it can be used in the manpage sources.
