We were setting GLIB_VERSION_MAX_ALLOWED to 2.34, since we provide
reimplementations of a few 2.34 functions in nm-glib-compat.h. But
this was turning off warnings for the 2.34+ APIs we *didn't* have
compat versions of too.
Fix this by setting MAX_ALLOWED to 2.32 (same as MIN_REQUIRED), and
defining macros to wrap calls to compat-ified functions and disable
deprecation warnings around them.
This points out several places where we were accidentally using 2.34
APIs without noticing, which need to be fixed now.
We were using g_utf8_strlen() to measure strings for layout, but that
counts combining marks too, and also fails to deal with "fullwidth"
(ie, double-width) CJK characters.
Add a new utility function to do a better job of this (based on code
from vte), and use it everywhere.
Unless NMTUI_DEBUG is set, don't pop up a dialog when a
g_warning/critical/etc occurs. Just hide the main screen briefly so
the error doesn't get printed over the UI, and restore it after; any
messages that get logged will be visible after nmtui exits.
