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From: Greg Wooledge <wooledg@eeg.ccf.org>
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Subject: Re: [readline] Multibyte invisible chars cause weird prompt length calculation issue
Date: Tue, 26 Nov 2019 08:44:18 -0500
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On Tue, Nov 26, 2019 at 07:35:09AM -0600, Dennis Williamson wrote:
> On Tue, Nov 26, 2019, 5:46 AM Алексей Шилин <rootlexx@mail.ru> wrote:
> > And they *are* enclosed: PS1='\[\e]0;\u@\h: \w\a\]${debian_chroot...
> 
> You have printable characters enclosed. For example, \u. _Each_ sequence of
> unprintable characters needs to be separately enclosed _without_ enclosing
> the printable ones.

You're misunderstanding.  The entire sequence from \e]0; to \a is a single
terminal escape sequence that says "all this stuff in between, put that
in the status title meta area, instead of writing it on the terminal".