The stage the signal emission is currently in, this
field will contain one of G_SIGNAL_RUN_FIRST,
G_SIGNAL_RUN_LAST or G_SIGNAL_RUN_CLEANUP and G_SIGNAL_ACCUMULATOR_FIRST_RUN.
G_SIGNAL_ACCUMULATOR_FIRST_RUN is only set for the first run of the accumulator
function for a signal emission.
The stage the signal emission is currently in, this field will contain one of G_SIGNAL_RUN_FIRST, G_SIGNAL_RUN_LAST or G_SIGNAL_RUN_CLEANUP and G_SIGNAL_ACCUMULATOR_FIRST_RUN. G_SIGNAL_ACCUMULATOR_FIRST_RUN is only set for the first run of the accumulator function for a signal emission.