bug#32883: 26.1; Emacs not response in shell mode

[alexei28]

-----Original Message-----
From: Eli Zaretskii <eliz@gnu.org> 
Sent: Sunday, September 30, 2018 20:06
To: alexei28 <alexei28@gmail.com>
Cc: 32883@debbugs.gnu.org
Subject: Re: bug#32883: 26.1; Emacs not response in shell mode

> From: "alexei28" <alexei28@gmail.com>
> Cc: <32883@debbugs.gnu.org>
> Date: Sun, 30 Sep 2018 18:14:35 +0300
> 
> I do the another test.
> 1. M-x shell
> 2. Open some text file (about 2 MB) by command  "cat some_text.txt".
> In shell mode something like this:
> 
> Microsoft Windows [Version 10.0.17134.285]
> (c) 2018 Microsoft Corporation. All rights reserved.
> 
> d:\TEMP\temp>cat trace.log.2018-08-09
> 
> 4. Start command
> 5. And while file is scrolling I press arrow up. As result cursor is 
> on the center of screen 6. Press Enter 7. And Emacs also "freeze". Not 
> response. In this case Emacs is not response only when file is opening 
> (scrolling).
> 8. After "cat" finish the Emacs is success unlock. In this case (file 
> size =
> 2 MB) it's unlock after 30 seconds. 
> But suppose file has size 200 MB. It's then unlock after one hour?
> It's not good.

But that is what is supposed to happen.  When you press Enter, shell-mode
takes all the stuff between the point where you pressed Enter and the end of
output, and submits that to the shell.  Since that's a lot of text, it could
take a long time to process.

So just don't do that, it makes no sense to do that in the situation you
describe.

So this is a not Emac's bug?
But  sometime I need to press Enter(while text is generate) because I , e.g.
want to insert some new text (e.g. notes) between existing text.