Terminal: full width characters won't be erased correctly

[orzFly]

Details (may be not important)

• VSCode Version: Code 1.17.0 (be377c0, 2017-10-05T06:07:51.906Z)
• OS Version: Darwin x64 16.7.0
• Extensions:

Extension	Author (truncated)	Version
bracket-pair-colorizer	Coe	0.10.9
erb	Cra	0.0.1
xml	Dot	1.9.2
EditorConfig	Edi	0.10.1
vscode-docker	Pet	0.0.18
quokka-vscode	Wal	1.0.68
yaml	ada	0.0.9
project-manager	ale	0.21.1
theme-verdandi	be5	1.6.0
path-intellisense	chr	1.4.2
regex	chr	0.1.0
gitignore	cod	0.5.0
python	don	0.7.0
gitlens	eam	5.4.1
tslint	eg2	1.0.9
vscode-npm-script	eg2	0.2.1
php-intellisense	fel	1.5.1
code-runner	for	0.7.2
tstools	iBo	1.1.3
vscode-icon-theme	jtl	1.5.0
Go	luk	0.6.66
cpptools	ms-	0.13.1
csharp	ms-	1.12.1
mono-debug	ms-	0.15.7
sublime-keybindings	ms-	2.9.1
vetur	oct	0.9.10
proto	pet	0.0.2
Ruby	reb	0.15.0
vscode-nginx	sha	0.4.1
vscode-fileutils	sle	2.7.0
autoimport	ste	1.2.2
vscode-import-cost	wix	2.5.0
JavaScriptSnippets	xab	1.5.0

(2 theme extensions excluded)

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Steps to Reproduce:

Run echo "你好，汉字！"; clear in the terminal

Reproduces without extensions: Yes

[orzFly]

Okay. My search keyword fails. Duplicated as #35660.