SCI_AUTOCSETCASEINSENSITIVEBEHAVIOUR(int behaviour)
SCI_AUTOCGETCASEINSENSITIVEBEHAVIOUR
When autocompletion is set to ignore case (SCI_AUTOCSETIGNORECASE), by default it will nonetheless select the first list member that matches in a case sensitive way to entered characters. This corresponds to a behaviour property of AC_SELECT_CI_RESPECT_CS (0). If you want autocompletion to ignore case at all, choose AC_SELECT_CI_IGNORE_CS (1).