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shell-backward-kill-word needs to behave more like werase

From: Basin Ilya
Subject: shell-backward-kill-word needs to behave more like werase
Date: Tue, 29 Jun 2021 00:44:36 +0300
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0

The default werase setting erases the series of white spaces before the caret, 
then it erases the preceding word (without touching the spaces before the word).
I expected that shell-backward-kill-word would do the same with the difference 
that the entire quoted argument would be erased.
However, shell-backward-kill-word erases the word immedeately preceding the 
caret plus it erases one additional space. This causes the inconvenience that 
after erasing the shell word you can't immediately type a new word. You have to 
type again a space that was deleted. I tried to restore the missing space using 
sequence of commands, but it restores an unwanted space after erasing the very 
first word:

    stty werase undef
    bind '"\C-\xff": delete-horizontal-space' # erase whitespaces following the 
    bind '"\C-\xfe": shell-backward-kill-word' # erase the word
    bind '"\C-w": "\C-\xff\C-\xfe "' # erase whitespaces, erase word, restore 1 

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