vscode: Mac crashes when searching on the sidebar search form.

Issue Type: Bug

Type validation-> in the sidebar search form.

When entering one character at a time

As soon as you enter the> character, the mac hangs and the mac restarts. I tried it several times, but even if I didn’t hang up, mac stopped and started moving for about 1 minute. In this case,> is input as many characters as validation->>>>>>>>>>>>>>>>>>>>.

When pasting validation-> string with copy and paste

Mac hangs up.

I think this bug did not occur before Ver1.40
Maybe related to #86913

VS Code version: Code 1.41.0 (9579eda04fdb3a9bba2750f15193e5fafe16b959, 2019-12-11T17:58:38.338Z) OS version: Darwin x64 18.7.0

System Info

Item	Value
CPUs	Intel® Core™ i7-8700B CPU @ 3.20GHz (12 x 3200)
GPU Status	2d_canvas: enabled flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled metal: disabled_off multiple_raster_threads: enabled_on oop_rasterization: disabled_off protected_video_decode: unavailable_off rasterization: enabled skia_renderer: disabled_off surface_control: disabled_off surface_synchronization: enabled_on video_decode: enabled viz_display_compositor: enabled_on viz_hit_test_surface_layer: disabled_off webgl: enabled webgl2: enabled
Load (avg)	3, 35, 30
Memory (System)	16.00GB (0.58GB free)
Process Argv	-psn_0_520319
Screen Reader	no
VM	0%

Extensions (64)

Extension	Author (truncated)	Version
html-snippets	abu	0.2.1
vscode-caniuse	aka	0.5.3
Bookmarks	ale	10.6.0
project-manager	ale	10.9.1
vagrant	bbe	0.5.0
path-intellisense	chr	1.4.2
regex	chr	0.2.0
bracket-pair-colorizer-2	Coe	0.0.29
vscode-svgviewer	css	2.0.0
vscode-eslint	dba	2.0.6
vscode-dash	dee	2.3.0
githistory	don	0.4.11
jquerysnippets	don	0.0.1
gitlens	eam	10.2.0
EditorConfig	Edi	0.14.3
apacheconf-snippets	eim	1.3.0
LogFileHighlighter	emi	2.6.0
vscode-great-icons	emm	2.1.47
prettier-vscode	esb	3.16.1
vscode-todo-plus	fab	4.14.1
php-debug	fel	1.13.0
auto-close-tag	for	0.5.6
auto-rename-tag	for	0.1.1
code-runner	for	0.9.15
vscode-google-translate	fun	1.4.2
vue-snippets	hol	0.1.11
minify	Hoo	0.4.3
rest-client	hum	0.23.0
output-colorizer	IBM	0.1.2
plantuml	jeb	2.13.5
docthis	joe	0.7.1
markdownfromcsv	joj	1.0.0
vscode-insertdatestring	jsy	2.2.4
vscode-sshfs	Kel	1.16.3
vscode-regexp-preivew	le0	0.0.3
vue	liu	0.1.5
MagicPython	mag	1.1.0
rainbow-csv	mec	1.3.1
easy-less	mrc	1.5.1
vscode-apache	mrm	1.2.0
vscode-csscomb	mrm	5.3.0
vscode-docker	ms-	0.9.0
vscode-language-pack-ja	MS-	1.41.2
mssql	ms-	1.8.0
python	ms-	2019.11.50794
debugger-for-chrome	msj	4.12.3
indent-rainbow	ode	7.4.0
csv-to-table	php	1.2.1
material-icon-theme	PKi	3.9.2
partial-diff	ryu	1.4.0
vscode-sql-beautify	sen	0.0.4
code-settings-sync	Sha	3.4.3
addDocComments	ste	0.0.8
pretty-json	sup	0.0.4
ayu	tea	0.18.0
pdf	tom	0.5.1
highlight-matching-tag	vin	0.9.6
vscode-icons	vsc	9.6.0
quokka-vscode	Wal	1.0.267
jinja	who	0.0.8
change-case	wma	1.0.0
better-align	wwm	1.1.6
JavaScriptSnippets	xab	1.7.2
markdown-pdf	yza	1.4.1

(5 theme extensions excluded)