Only top-left quadrant of window drawn after display/resolution change

[fiendish]

Issue Type: Bug

Problem happens usually when I've just plugged in external monitors (dual side-by-side Dell U2718Q connected via USBC-DisplayPort cables) and woken my laptop (MacBook Pro 15-inch, 2017) up from sleep. But I can also sometimes reproduce it when switching between maximum and scaled less than maximum screen resolutions in macOS (10.13.6) system preferences.

Problem manifests as only the top-left quadrant of the window being drawn and the rest being blank white (as shown here in images). As you can see, it also affects the bug reporting window.

The problem fixes itself (the window fully paints) if I drag the window past the barrier between my displays and then back.

VS Code version: Code 1.27.1 (5944e81, 2018-09-06T09:14:32.385Z)
OS version: Darwin x64 17.7.0

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz (8 x 2800)
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 video_decode: enabled video_encode: enabled webgl: enabled webgl2: enabled
Load (avg)	1, 2, 2
Memory (System)	16.00GB (1.11GB free)
Process Argv	/Applications/Visual Studio Code.app/Contents/MacOS/Electron .
Screen Reader	no
VM	0%

Extensions (17)

Extension	Author (truncated)	Version
emojisense	bie	0.4.1
markdown-preview-github-styles	bie	0.1.3
vscode-svgviewer	css	1.4.6
vscode-markdownlint	Dav	0.20.0
jupyter	don	1.1.4
gitlens	eam	8.5.6
gc-excelviewer	Gra	2.1.26
nbpreviewer	jit	1.0.0
theme-dark-plus-contrast	k3a	0.1.101
rainbow-csv	mec	0.5.0
python	ms-	2018.8.0
rewrap	stk	1.9.1
vscode-gitmoji-snippets	thi	3.2.0
vscode-lua	tri	0.12.4
python-extended-snippets	tus	0.0.1
markdown-all-in-one	yzh	1.6.0
propertylist	zho	0.0.2

(1 theme extensions excluded)

[bpasero]

We are building exploration builds that use a much newer version of Electron (our UI framework). I wonder if this issue reproduces with one of these builds, could you try? Download:

• macOS: Download
• Linux: Download
• Windows: Download

[fiendish]

I am trying the exploration build now. So far so good, but if it happens again I'll report back.

[bpasero]

Ok please do

[fiendish]

I think I can pretty reliably confirm now that the exploration build does fix the problem after going back and forth between the different versions over several days.

[bpasero]

Closing this issue given that we plan to release VSCode stable early February with Electron 3.x. If you want to benefit from the fix already, consider to use our insiders version that already contains the fix: https://code.visualstudio.com/insiders/