general: simplify the detection of a SIGWINCH

There is no need for a counter, nor an old counter to compare it with.

src/global.c

@@ -29,8 +29,8 @@
 
 /* Global variables. */
 #ifndef NANO_TINY
-volatile sig_atomic_t sigwinch_counter = 0;
-	/* Is incremented by the handler whenever a SIGWINCH occurs. */
+volatile sig_atomic_t the_window_resized = FALSE;
+	/* Set to TRUE by the handler whenever a SIGWINCH occurs. */
 #endif
 
 #ifdef __linux__

src/nano.c

@@ -1289,7 +1289,7 @@ RETSIGTYPE do_continue(int signal)
 RETSIGTYPE handle_sigwinch(int signal)
 {
     /* Let the input routine know that a SIGWINCH has occurred. */
-    sigwinch_counter++;
+    the_window_resized = TRUE;
 }
 
 /* Reinitialize and redraw the screen completely. */
@@ -1299,6 +1299,9 @@ void regenerate_screen(void)
     int fd, result = 0;
     struct winsize win;
 
+    /* Reset the trigger. */
+    the_window_resized = FALSE;
+
     if (tty == NULL)
 	return;
     fd = open(tty, O_RDWR);

src/proto.h

@@ -26,7 +26,7 @@
 
 /* All external variables.  See global.c for their descriptions. */
 #ifndef NANO_TINY
-extern volatile sig_atomic_t sigwinch_counter;
+extern volatile sig_atomic_t the_window_resized;
 #endif
 
 #ifdef __linux__

src/winio.c

@@ -55,21 +55,6 @@ static bool seen_wide = FALSE;
 	/* Whether we've seen a multicolumn character in the current line. */
 #endif
 
-#ifndef NANO_TINY
-static sig_atomic_t last_sigwinch_counter = 0;
-
-/* Did we receive a SIGWINCH since we were last called? */
-bool the_window_resized(void)
-{
-    if (sigwinch_counter == last_sigwinch_counter)
-	return FALSE;
-
-    last_sigwinch_counter = sigwinch_counter;
-    regenerate_screen();
-    return TRUE;
-}
-#endif
-
 /* Control character compatibility:
  *
  * - Ctrl-H is Backspace under ASCII, ANSI, VT100, and VT220.
@@ -144,8 +129,9 @@ void get_key_buffer(WINDOW *win)
     input = wgetch(win);
 
 #ifndef NANO_TINY
-    if (the_window_resized()) {
+    if (the_window_resized) {
 	ungetch(input);
+	regenerate_screen();
 	input = KEY_WINCH;
     }
 #endif
@@ -162,7 +148,8 @@ void get_key_buffer(WINDOW *win)
 	    handle_hupterm(0);
 
 #ifndef NANO_TINY
-	if (the_window_resized()) {
+	if (the_window_resized) {
+	    regenerate_screen();
 	    input = KEY_WINCH;
 	    break;
 	}