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reverse-i-search, multibyte backspace problem

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Hello,

I've noticed a bug with terminal usage of bash.

Steps to reproduce:
1. Press control-r to get in reverse-i-search mode
2. Enter a key outside of the ASCII character set, like the french é or the german ä.
3. Press backspace.

What to expect:
The key gets removed.

What happens:
Instead of the whole key getting removed, you can see a weird character (like � or Ã) appear.

The most likely theory:
Instead of adhering to the utf-8 multibyte specification, and removing the whole multibyte codepoint encoding sequence (or perhaps the whole sequence representing the "abstract character"? [1]), it just removes the last byte.

Note that the bug is dependent on the terminal. I've originally discovered the bug on konsole, but it has been confirmed by other users on the freenode #bash channel to exist on xterm, st and rxvt, but one user couldn't reproduce it with st.

Affected versions:
I've tested 4.3.30(1)-release (my distro's packaged one) and 4.3.39(2)-release, the latter coming straight from the development git repository's master branch, compiled with ./configure && make -j 4.
The operating system I use is Kubuntu, but it has been confirmed to exist on Gentoo and arch linux too. 

Thanks for answers.

Greetings
Est31.

[1]: Quoting the Unicode standard, version 7,  Section 3.4, Characters and Encoding:
"A single abstract character may also be represented by a sequence of code points—for example, "latin capital letter g with acute" may be represented by the sequence <U+0047 "latin capital letter g", U+0301 "combining acute accent">, rather than being mapped to a single code point."

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reverse-i-search, multibyte backspace problem e est <mtest31@yandex.com> - 2015-07-18 22:23 +0200

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