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/testdir/dumps/Test_echowindow_9.dump b/src/testdir/dumps/Test_echowindow_9.dump
index 2efdef0..8c48d62 100644
--- a/src/testdir/dumps/Test_echowindow_9.dump
+++ b/src/testdir/dumps/Test_echowindow_9.dump
@@ -4,5 +4,5 @@
 |~| @73
 |~| @73
 |~| @73
-|:+0#0000000&|c|a|l@1| |H|i|d|e|W|i|n|(|)| @59
+| +0#0000000&@74
 @57|0|,|0|-|1| @8|A|l@1|