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, 5 insertions, 0 deletions

diff --git a/editors/vi.c b/editors/vi.c
index b2d185193..75ce8d396 100644
--- a/editors/vi.c
+++ b/editors/vi.c
@@ -3074,7 +3074,12 @@ static void go_bottom_and_clear_to_eol(void)
 //----- Erase from cursor to end of screen -----------------------
 static void clear_to_eos(void)
 {
+#if !ENABLE_PLATFORM_MINGW32
         write1(ESC_CLEAR2EOS);
+#else
+        /* in practice clear_to_eos() always clears the entire screen */
+        reset_screen();
+#endif
 }
 
 //----- Start standout mode ------------------------------------