When SIGINT signal is raised, the CK_Cancel message is handled by
dlg_execute_cmd() and midnight_dlg is closed.
The solution: CK_Cancel is sent to current dialog via callback, and if
current dialog doesn't handle CK_Cancel message, then handle it with common
way using dlg_execute_cmd().
Since Ctrl-g is used to generate SIGINT in MC, remove this shortcut from
all sections of keymaps except the [dialog] section.
Signed-off-by: Andrew Borodin <aborodin@vmail.ru>
f83bdadfa8