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bug#41423: 27.0.91; eshell file completion in tramp dir is slow (3 minut


From: Tim Vaughan
Subject: bug#41423: 27.0.91; eshell file completion in tramp dir is slow (3 minutes) [regression on pretest]
Date: Wed, 19 Aug 2020 12:24:03 +0200
User-agent: Cyrus-JMAP/3.3.0-191-gef79d59-fm-20200818.001-gef79d590

Just a heads up: I believe I'm experiencing this bug under 27.1.  (Before 
finding this bug report I also did a bisection and found the same culprit 
commit that Andres did.).  Thus I expect it somehow manage to escape pretest.

Additionally, I've noticed that although the effect is severe only in tramp 
directories, there is a noticeable (~0.5s) pause when executing commands in 
local directories, provided autocompletion has been used to create the command 
string.  (The exact same command does not seem to cause the delay when typed in 
without invoking autocompletion.)

I'm not at all familiar with the eshell code, but I spent some time trying to 
identify the cause.  Weirdly the behaviour does not seem to occur when I 
instrument `eshell-send-input', making it a bit of a heisenbug.

Tim





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