patch 8.2.3763: when editing the cmdline a callback may cause a scroll up

Problem:    When editing the command line a FocusLost callback may cause the
            screen to scroll up.
Solution:   Do not redraw at the last line but at the same place where the
            command line was before. (closes #9295)
diff --git a/src/channel.c b/src/channel.c
index 6343124..05e2489 100644
--- a/src/channel.c
+++ b/src/channel.c
@@ -3205,7 +3205,7 @@
 	      if (channel_need_redraw)
 	      {
 		  channel_need_redraw = FALSE;
-		  redraw_after_callback(TRUE);
+		  redraw_after_callback(TRUE, FALSE);
 	      }
 
 	      if (!channel->ch_drop_never)
@@ -4687,7 +4687,7 @@
     if (channel_need_redraw)
     {
 	channel_need_redraw = FALSE;
-	redraw_after_callback(TRUE);
+	redraw_after_callback(TRUE, FALSE);
     }
 
     --safe_to_invoke_callback;