Magic number 1 changed to 2 in one place. Missed in earlier fix for #10127.
Changed magic number to a defined macro constant so it might not happen again,
should GimpConfig change again.
Improper counting of args declared by scripts versus pspecs in a ProcedureConfig.
Scripts don't declare run_mode, while pspecs have run_mode and an extra internal pspec
that is not an argument.
Also in gimp_procedure_config_begin_run(), make sure we sync the arguments with
the config object first thing, even in interactive and with-last-vals case
(where the args may be further overridden). This was especially important for
Script-fu scripts as the image and drawable were not provided separately, so we
need to make sure that the config file has the right values.
Resolves#8382
Also v2 scripts infer and set sensitivity to drawables
Add two test plugins clothify-v3.scm and test-sphere-v3.scm.
Temporary, to be removed when 3.0 ships.
Some refactoring (extracting methods, moving functions to new files).
Some drive-by fixes to script-fu-arg.c revealed by using GimpProcedureDialog.
