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bug#31855: 27.0.50; Async shell command finished message not visible any

From: Daniel Colascione
Subject: bug#31855: 27.0.50; Async shell command finished message not visible any more
Date: Sat, 16 Jun 2018 14:17:22 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0

On 06/16/2018 01:48 AM, Eli Zaretskii wrote:
From: Michael Heerdegen <address@hidden>
Date: Sat, 16 Jun 2018 07:12:50 +0200

In emacs25 -Q, I type, for example, M-! t r u e SPC & <return>, and the
echo area displays "true: finished".

In master emacs -Q, doing the same gives you no visible feedback any
more.  A message is logged in *Messages*, but it seems to be dismissed

Daniel, this seems to be due to your recent changes in keyboard.c.  If
I make the change below, which reverts a small part of your changes,
the problem is gone:

diff --git a/src/keyboard.c b/src/keyboard.c
index 5409918..76097e8 100644
--- a/src/keyboard.c
+++ b/src/keyboard.c
@@ -8999,7 +8999,7 @@ read_key_sequence (Lisp_Object *keybuf, Lisp_Object 
    /* These are no-ops the first time through, but if we restart, they
       revert the echo area and this_command_keys to their original state.  */
    this_command_key_count = keys_start;
-  if (INTERACTIVE && is_replay)
+  if (INTERACTIVE && t < mock_input)
      echo_truncate (echo_start);
    is_replay = true;

Yep. You're right. I'll bring us back to the old logic here.

I just worry that the "t < mock_input" condition is wrong in the case where we use a function key map to rewrite an input to nothing, but maybe the improved last_nonmenu_event tracking will fix that class of problem by itself.

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