libbb/lineedit: scroll to cursor position on any keypress

Also improve erase_till_end_of_screen.  Based on suggestions from
GitHub user avih.

1 files changed, 5 insertions, 3 deletions

diff --git a/libbb/lineedit.c b/libbb/lineedit.c
index 37c106bd8..e7b9ddfa1 100644
--- a/libbb/lineedit.c
+++ b/libbb/lineedit.c
@@ -2440,6 +2440,11 @@ int FAST_FUNC read_line_input(line_input_t *st, const char *prompt, char *comman
 
                 fflush_all();
                 ic = ic_raw = lineedit_read_key(read_key_buffer, timeout);
+#if ENABLE_PLATFORM_MINGW32
+                /* scroll to cursor position on any keypress */
+                if (isatty(fileno(stdin)) && isatty(fileno(stdout)))
+                        move_cursor_row(0);
+#endif
 
 #if ENABLE_FEATURE_REVERSE_SEARCH
  again:
@@ -2510,9 +2515,6 @@ int FAST_FUNC read_line_input(line_input_t *st, const char *prompt, char *comman
                 case CTRL('L'):
                 vi_case(CTRL('L')|VI_CMDMODE_BIT:)
                         /* Control-l -- clear screen */
-#if ENABLE_PLATFORM_MINGW32
-                        printf(ESC"[0A"); /* move to current cursor postion */
-#endif
                         printf(ESC"[H"); /* cursor to top,left */
                         redraw(0, command_len - cursor);
                         break;