winansi: add a routine to clear the screen bufferansi

And use it to restore the old behaviour of vi and less:  they reset
the cursor to the top of the buffer and clear it.

1 files changed, 1 insertions, 0 deletions

diff --git a/include/mingw.h b/include/mingw.h
index 5faef41bf..555fa96b7 100644
--- a/include/mingw.h
+++ b/include/mingw.h
@@ -155,6 +155,7 @@ int mingw_pclose(FILE *fd);
  */
 
 void move_cursor_row(int n);
+void reset_screen(void);
 int winansi_putchar(int c);
 int winansi_puts(const char *s);
 size_t winansi_fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream);