[pushed] [gdb/testsuite] Fix gdb.tui/scroll-bottom-right.exp with editing off

[Tom de Vries <tdevries@suse.de>]

With test-case gdb.tui/scroll-bottom-right.exp and make-check-all.sh I
ran into:
...
HOST BOARD: local-remote-host-notty, TARGET BOARD: remote-gdbserver-on-localhost
FAIL: gdb.tui/scroll-bottom-right.exp: prompt at left border
FAIL: gdb.tui/scroll-bottom-right.exp: responsive prompt
...

The problem is that the host board sets editing to off, while the test-case
uses ^L, which requires editing on.

Fix this by using echo instead.

Tested on x86_64-linux.
---
 gdb/testsuite/gdb.tui/scroll-bottom-right.exp | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/gdb/testsuite/gdb.tui/scroll-bottom-right.exp b/gdb/testsuite/gdb.tui/scroll-bottom-right.exp
index ff00e90bb56..0abf9c29ffb 100644
--- a/gdb/testsuite/gdb.tui/scroll-bottom-right.exp
+++ b/gdb/testsuite/gdb.tui/scroll-bottom-right.exp
@@ -53,9 +53,13 @@ gdb_assert \
     {[Term::wait_for_region_contents {*}$last_line "$gdb_prompt"]} \
     "got back prompt"
 
-# Send ^L to get prompt at left border.  Echo doesn't add an implicit newline,
-# so the prompt is now near the right border.
-send_gdb "\014"
+# The echo command doesn't add an implicit newline, so after
+# "echo $str60$str10" the prompt ends up near the right border.  Send an echo
+# without arguments to get the prompt at the left border.
+#   (gdb) echo 0123456789...0123456789
+#   0123456789...0123456789(gdb) echo
+#   (gdb)
+send_gdb "echo\n"
 gdb_assert {[Term::wait_for ""]} "prompt at left border"
 
 # Check that gdb is responsive.

base-commit: 2605fa5d119b31d383ca7826d45266edd6cd2a21
-- 
2.51.0