Error when drag settings editor

[rebornix]

Issue Type: Bug

• Open settings editor
• Drag the title bar
• "Cannot read property 'query' of null"

VS Code version: Code - Insiders 1.35.0-insider (6964233, 2019-05-29T05:16:24.636Z)
OS version: Darwin x64 18.5.0

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-4770HQ CPU @ 2.20GHz (8 x 2200)
GPU Status	2d_canvas: enabled checker_imaging: disabled_off flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on native_gpu_memory_buffers: enabled rasterization: enabled surface_synchronization: enabled_on video_decode: enabled webgl: enabled webgl2: enabled
Load (avg)	4, 4, 3
Memory (System)	16.00GB (0.54GB free)
Process Argv	-psn_0_24983506
Screen Reader	no
VM	18%

Extensions (52)

Extension	Author (truncated)	Version
spellright	ban	3.0.38
markdown-emoji	bie	0.0.9
npm-intellisense	chr	1.3.0
vscode-svgviewer	css	2.0.0
vscode-markdownlint	Dav	0.26.0
vscode-eslint	dba	1.9.0
xml	Dot	2.4.0
gitlens	eam	9.8.1
tsl-problem-matcher	eam	0.0.4
EditorConfig	Edi	0.13.0
tslint	eg2	1.0.43
vscode-npm-script	eg2	0.3.7
vsc-material-theme	Equ	2.9.0
flow-for-vscode	flo	1.1.1
vscode-pull-request-github-insiders	Git	1.144.0
ocaml	hac	0.6.43
beautify	Hoo	1.5.0
vscode-ghc-mod	hoo	1.2.0
references-plusplus	jri	0.0.5
language-haskell	jus	2.6.0
vscode-colorize	kam	0.8.10
graphql-for-vscode	kum	1.13.1
dotenv	mik	1.0.1
theme-monokai-pro-vscode	mon	1.1.13
vscode-azurefunctions	ms-	0.17.1
vscode-language-pack-zh-hans	MS-	1.35.0
python	ms-	2019.5.17059
richcodenav	MS-	0.1.49
remote-containers	ms-	0.57.0
azure-account	ms-	0.8.4
cpptools	ms-	0.23.1
Go	ms-	0.10.2
powershell	ms-	2019.5.0
vscode-typescript-tslint-plugin	ms-	1.1.0
wordcount	ms-	0.1.0
vsliveshare	ms-	1.0.249
debugger-for-chrome	msj	4.11.3
debugger-for-ios-web	msj	0.1.2
vetur	oct	0.21.0
subtitles-editor	pep	1.0.4
vscode-docker	Pet	0.6.2
vscode-versionlens	pfl	0.23.0
material-icon-theme	PKi	3.8.0
seti-icons	qin	0.1.3
ruby	reb	0.22.3
smartpaste	reb	0.0.3
toggle	reb	0.0.1
sass-indented	rob	1.5.1
rust	rus	0.6.1
sourcekit-lsp	unp	0.0.1
vscode-lldb	vad	1.2.3
vscode-swiftformat	vkn	1.3.2

(12 theme extensions excluded)