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Crash when moving full-width glyphs across lines

From: Christian Dürr
Subject: Crash when moving full-width glyphs across lines
Date: Mon, 16 Dec 2019 16:37:28 +0100
User-agent: Cyrus-JMAP/3.1.7-680-g58d4e90-fmstable-20191213v1

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -march=x86-64 -mtune=generic -O2 -pipe -fno-plt 
-DSTANDARD_UTILS_PATH='/usr/bin' -DSYS_BASHRC='/etc/bash.bashrc' 
-Wno-parentheses -Wno-format-security
uname output: Linux archhq 5.4.2-arch1-1 #1 SMP PREEMPT Thu, 05 Dec 2019 
12:29:40 +0000 x86_64 GNU/Linux
Machine Type: x86_64-pc-linux-gnu

Bash Version: 5.0
Patch Level: 11
Release Status: release

    Bash will crash when moving full-width unicode glyphs like `こ` across line

    Paste `https://こんにち` into bash and add whitespace before it until it is
    in the next line. Then start deleting that whitespace until it is on the
    previous line again. It should crash as soon as only `https://` is on the
    original line.

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