display: redraw the screen in tiny version upon resuming from suspension

Letting the dummy key KEY_FRESH do a full refresh in the tiny version
allows a 'fg' to properly resume after an external SIGSTOP.

(Reminder: the ungetch() is needed in the normal version to prevent
the eating of a keystroke: https://savannah.gnu.org/bugs/?48331.)

src/definitions.h

@@ -218,7 +218,7 @@
 #define FOREIGN_SEQUENCE  0x4FC
 
 /* A special keycode for plugging into the input stream after a suspension. */
-#define KEY_FLUSH  KEY_F0
+#define KEY_FRESH  0x4FE
 
 #ifndef NANO_TINY
 /* A special keycode for when we get a SIGWINCH (a window resize). */

src/global.c

@@ -1503,6 +1503,8 @@ void shortcut_init(void)
 	add_to_sclist(MMAIN, "", KEY_SIC, do_insertfile, 0);
 	/* Catch and ignore bracketed paste marker keys. */
 	add_to_sclist(MMOST|MBROWSER|MHELP|MYESNO, "", BRACKETED_PASTE_MARKER, do_nothing, 0);
+#else
+	add_to_sclist(MMOST|MBROWSER|MHELP|MYESNO, "", KEY_FRESH, full_refresh, 0);
 #endif
 }
 

src/nano.c

@@ -991,7 +991,7 @@ void continue_nano(int signal)
 #endif
 
 	/* Insert a fake keystroke, to neutralize a key-eating issue. */
-	ungetch(KEY_FLUSH);
+	ungetch(KEY_FRESH);
 }
 
 #if !defined(NANO_TINY) || defined(ENABLE_SPELLER) || defined(ENABLE_COLOR)

src/winio.c

@@ -1263,7 +1263,9 @@ int parse_kbinput(WINDOW *win)
 #ifdef KEY_RESIZE  /* SunOS 5.7-5.9 doesn't know KEY_RESIZE. */
 		case KEY_RESIZE:
 #endif
-		case KEY_FLUSH:
+#ifndef NANO_TINY
+		case KEY_FRESH:
+#endif
 			return ERR;    /* Ignore this keystroke. */
 	}