bug#35732: eshell case-insensitive completion

[Dario Klingenberg]

Dear all,

I am experiencing a strange behaviour of eshell on emacs 26.2:

Steps to reproduce:

emacs -Q
M-x eshell
(setq pcomplete-ignore-case t)

Description:

Under some circumstances, completion of paths starting with "~" leads to "~" being expanded to the full path and overwriting the previous text.

Example: suppose I wanted to copy the directory ~/Documents/some_directory/ to my ~/Downloads/ folder. I type

cp -r ~/doc<TAB>

and it correctly expands to 

cp -r ~/Documents/

However, when I continue with

cp -r ~/Documents/my_directory ~/dow<TAB>

it expands to

cp -r ~/Docume/home/username/Downloads/

It seems related to this bug: https://lists.gnu.org/archive/html/bug-gnu-emacs/2012-11/msg00878.html

In GNU Emacs 26.2 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.7)
 of 2019-04-17 built on localhost
Windowing system distributor 'The X.Org Foundation', version 11.0.12004000
System Description:    Manjaro Linux

Configured using:
 'configure
 CONFIG_SHELL=/gnu/store/q19l04vd2za80mk1845pz7r8cz29qk43-bash-minimal-4.4.23/bin/bash
 SHELL=/gnu/store/q19l04vd2za80mk1845pz7r8cz29qk43-bash-minimal-4.4.23/bin/bash
 --prefix=/gnu/store/b38pn0gnj4jsrf79lg4kr80rn5kaim0q-emacs-26.2
 --enable-fast-install --with-modules'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND DBUS GSETTINGS GLIB NOTIFY
ACL GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB TOOLKIT_SCROLL_BARS
GTK3 X11 XDBE XIM MODULES THREADS

Memory information:
((conses 16 820281 36352)
 (symbols 48 72804 17)
 (miscs 40 147 163)
 (strings 32 218249 11988)
 (string-bytes 1 6827776)
 (vectors 16 118557)
 (vector-slots 8 1948506 26962)
 (floats 8 610 381)
 (intervals 56 640 0)
 (buffers 992 13))

Best regards,

Dario