Document is not centered in Centered layout and Zen mode after resizing

[alexdevero]

Issue Type: Bug

Openned document is not centered in centered and zen mode after resizing it, changing its width. The gaps on sides are not changed evenly, only one sides either grows or shrinks.

1. Open some document.
2. Toggle Zen or Centered mode
3. Rezize the width of the document.

Expected:
When resizing the document, changing its width, the gaps will shrink/grow evenly - the document will remain in the center of the screen.

Zen mode:

Centered layout:

VS Code version: Code - Insiders 1.25.0-insider (28d5806, 2018-06-11T05:17:42.700Z)
OS version: Windows_NT x64 10.0.17134

System Info

Item	Value
CPUs	Intel(R) Core(TM) i5-4210M CPU @ 2.60GHz (4 x 2594)
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: disabled_software rasterization: enabled video_decode: enabled video_encode: enabled webgl: enabled webgl2: enabled
Memory (System)	15.89GB (10.20GB free)
Process Argv	E:\Programs\Documents\Microsoft VS Code Insiders\Code - Insiders.exe
Screen Reader	no
VM	0%

Extensions (18)

Extension	Author (truncated)	Version
color-info	bie	0.5.0
language-postcss	cpy	1.0.5
vscode-svgviewer	css	1.4.4
EditorConfig	Edi	0.12.4
vsc-material-theme	Equ	2.1.0
auto-close-tag	for	0.5.6
wordcounter	kir	1.2.2
contextualduplicate	laf	0.2.0
vscode-language-babel	mgm	0.0.14
dotenv	mik	1.0.1
vscode-csscomb	mrm	5.2.2
vscode-duplicate	mrm	1.2.1
vscode-icons	rob	7.23.0
code-settings-sync	Sha	2.9.2
code-spell-checker	str	1.6.10
code-spell-checker-czech	str	0.1.0
dictionary-completion	yzh	0.6.1
html-css-class-completion	Zig	1.17.1

(1 theme extensions excluded)

[vscodebot]

(Experimental duplicate detection)
Thanks for submitting this issue. Please also check if it is already covered by an existing one, like:

• Centered editor layout shuold be per workspace not window (#46277)
• Image editor is not centered in Centered Layout (#47799)
• Centered layout drag to resize mouseover obstructing open file tab. (#46874)
• Feature request: do not apply centered layout to webviews (#50885)
• Center panel with centered editor (#44903)

[isidorn]

Dup of #50936