Run a single iteration of the main loop, only block until an event is noticed if blocking

Property definitions

gtk :: gtk_core $ Sys :: gtk_main_iteration_do
# Run a single iteration of the main loop, only block until an event is noticed if `blocking`
fun gtk_main_iteration_do(blocking: Bool): Bool `{ return gtk_main_iteration_do(blocking); `}
lib/gtk/v3_4/gtk_core.nit:54,1--55,93