patch 8.1.1419: listener callbacks may be called recursively

Problem:    Listener callbacks may be called recursively.
Solution:   Set "updating_screen" while listener callbacks are invoked.
diff --git a/src/proto/screen.pro b/src/proto/screen.pro
index 0657831..ab73e0b 100644
--- a/src/proto/screen.pro
+++ b/src/proto/screen.pro
@@ -10,7 +10,7 @@
 int redraw_asap(int type);
 void redraw_after_callback(int call_update_screen);
 void redrawWinline(win_T *wp, linenr_T lnum);
-void reset_updating_screen(int may_resize_shell);
+void after_updating_screen(int may_resize_shell);
 void update_curbuf(int type);
 int update_screen(int type_arg);
 int conceal_cursor_line(win_T *wp);
@@ -18,7 +18,7 @@
 void update_debug_sign(buf_T *buf, linenr_T lnum);
 void updateWindow(win_T *wp);
 int screen_get_current_line_off(void);
-void screen_line(int row, int coloff, int endcol, int clear_width, int rlflag);
+void screen_line(int row, int coloff, int endcol, int clear_width, int flags);
 void rl_mirror(char_u *str);
 void status_redraw_all(void);
 void status_redraw_curbuf(void);