Trigger line erase when moving through history

Author: dunkmann00

lib/mp-readline/readline.c

@@ -279,6 +279,9 @@ int readline_process_char(int c) {
                     redraw_step_back = rl.cursor_pos - rl.orig_line_len;
                     redraw_from_cursor = true;
                     redraw_step_forward = rl.line->len - rl.orig_line_len;
+                    // We need to trigger a line erase because we don't know if the new line is longer
+                    // when taking continuation characters into account
+                    last_line_len = rl.line->len+1;
                 }
             } else if (c == 'B') {
 #if MICROPY_REPL_EMACS_KEYS
@@ -299,6 +302,9 @@ int readline_process_char(int c) {
                     redraw_step_back = rl.cursor_pos - rl.orig_line_len;
                     redraw_from_cursor = true;
                     redraw_step_forward = rl.line->len - rl.orig_line_len;
+                    // We need to trigger a line erase because we don't know if the new line is longer
+                    // when taking continuation characters into account
+                    last_line_len = rl.line->len+1;
                 }
             } else if (c == 'C') {
 #if MICROPY_REPL_EMACS_KEYS