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Jehan authored
Since commit a427213f, the special glib value "help" does not work anymore as a helper (listing the list of available flags). This means that to use GIMP_DEBUG environment variable, one has to either know them all by heart or check the app/gimp-log.c file. This commit still leaves "help" as a normal flag for GIMP_LOG_HELP domain in GIMP, but creates instead "list-all" as the new helper value. Moreover as a fallback, setting a random value to GIMP_DEBUG with no valid flags in it will also output the list of available flags. This way, one doesn't even have to remember a specific string to obtain the list.
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