patch 9.1.0710: popup window may hide part of Command line

Problem:  when a popup window covers the command line,
          the command line is not completely cleared on popup_hide()
          (yu3s)
Solution: Check if the popup window covers the command line and if it
          does, set the clear_cmdline flag.

fixes: #15608
closes: #15610

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/popupwin.c b/src/popupwin.c
index 0ff57fb..8c56717 100644
--- a/src/popupwin.c
+++ b/src/popupwin.c
@@ -2758,6 +2758,8 @@
 
     wp->w_popup_flags |= POPF_HIDDEN;
     // Do not decrement b_nwindows, we still reference the buffer.
+    if (wp->w_winrow + popup_height(wp) >= cmdline_row)
+	clear_cmdline = TRUE;
     redraw_all_later(UPD_NOT_VALID);
     popup_mask_refresh = TRUE;
 }