Set the curses resize policy to use tioctl()

mutt_resize_screen() calls mutt_reflow_windows(), which records window
sizes in those data structures.  After a endwin(), curses will also
check the terminal size, but it if uses a different policy than Mutt,
the screen will be drawn incorrectly.

I looked into adding a config option to change this, but ran into a
chicken-egg problem.  initscr() must be called before the config is
processed, to allow for color setting.  However, use_env() must be
called before initscr().  So for now, just set to policy to ignore the
env vars, except as a fallback.

2 files changed, 10 insertions, 1 deletions

diff --git a/configure.ac b/configure.ac
index c12bce88..cacdf013 100644
--- a/configure.ac
+++ b/configure.ac
@@ -85,6 +85,8 @@ AH_TEMPLATE([HAVE_SETCCHAR],
             [Define if you have setcchar, as a function or macro.])
 AH_TEMPLATE([HAVE_BKGRNDSET],
             [Define if you have bkgrndset, as a function or macro.])
+AH_TEMPLATE([HAVE_USE_TIOCTL],
+            [Define if you have use_tioctl, as a function or macro.])
 AH_TEMPLATE([SIG_ATOMIC_VOLATILE_T],
             [Some systems declare sig_atomic_t as volatile, some others -- no.
              This define will have value `sig_atomic_t' or
@@ -360,7 +362,7 @@ main ()
         old_LIBS="$LIBS"
         LIBS="$LIBS $MUTTLIBS"
         CF_CHECK_FUNCDECLS([#include <${cf_cv_ncurses_header-curses.h}>],
-                           [start_color typeahead bkgdset curs_set meta use_default_colors resizeterm setcchar bkgrndset])
+                           [start_color typeahead bkgdset curs_set meta use_default_colors resizeterm setcchar bkgrndset use_tioctl])
         if test "$ac_cv_func_decl_start_color" = yes; then
                 AC_DEFINE(HAVE_COLOR,1,[ Define if your curses library supports color. ])
         fi
diff --git a/main.c b/main.c
index c497eadb..3b0a38ef 100644
--- a/main.c
+++ b/main.c
@@ -598,6 +598,13 @@ static void start_curses (void)
   SLutf8_enable(-1);
 #endif
 #else
+
+# if defined(HAVE_RESIZETERM) && defined(HAVE_USE_TIOCTL)
+  /* mutt_resize_screen() shouldn't be fighting with ncurses */
+  use_env (0);
+  use_tioctl (1);
+# endif
+
   /* should come before initscr() so that ncurses 4.2 doesn't try to install
      its own SIGWINCH handler */
   mutt_signal_init ();