Follow-up to f858d94, only reinitialize screen when toggling debug mode

The screen_init() call for each print() & C:o caused serious screen
artefacts in debug mode.  This patch reworks f858d94 to only re-init
screen when toggling debug.

Also, avoid screen_init() completely if started in debug mode.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

src/finit.c

@@ -303,7 +303,7 @@ int main(int argc, char* argv[])
 	conf_parse_cmdline();
 
 	/* Set up canvas */
-	if (!rescue)
+	if (!rescue && !log_is_debug())
 		screen_init();
 
 	/*

src/helpers.c

@@ -110,13 +110,6 @@ void print(int action, const char *fmt, ...)
 	if (log_is_silent())
 		return;
 
-	/*
-	 * In debug mode we must reinitialize often, user may be
-	 * resizing their terminal to cope with debug output.
-	 */
-	if (log_is_debug())
-		screen_init();
-
 	if (fmt) {
 		va_start(ap, fmt);
 		printv(fmt, ap);

src/log.c

@@ -67,8 +67,14 @@ void log_exit(void)
 		fputs("\n", stderr);
 	}
 
-	/* Reinitialize screen, terminal may have been resized at runtime */
-	screen_init();
+	/*
+	 * Unless in debug mode at shutdown, Reinitialize screen,
+	 * terminal may have been resized at runtime
+	 */
+	if (debug)
+		screen_exit();
+	else
+		screen_init();
 }
 
 void log_open(void)
@@ -106,9 +112,13 @@ void log_debug(void)
 	if (debug) {
 		silent   = 0;
 		loglevel = LOG_DEBUG;
+
+		screen_exit();
 	} else {
 		silent   = SILENT_MODE;
 		loglevel = LOG_NOTICE;
+
+		screen_init();
 	}
 	log_open();