Markdown preview stops updating restarting extension host

[sbatten]

Type: Bug

1. Open 2 markdown files
2. Open markdown preview
3. Switch focus between markdown files to see the preview update
4. Restart the extension host (this happens frequently now that we support that when extensions update instead of a full window reload)
5. Try switching focus between markdown files again
   🐛 => preview stops updating

VS Code version: Code - Insiders 1.88.0-insider (9e0b3f3, 2024-03-27T21:47:00.626Z)
OS version: Windows_NT x64 10.0.22631
Modes:

Extensions (31)

Extension	Author (truncated)	Version
codesnap	adp	1.3.4
markdown-checkbox	bie	0.4.0
markdown-emoji	bie	0.3.0
simple-icons	com	0.1.6
vsc-material-theme-icons	equ	3.5.0
prettier-vscode	esb	10.4.0
codespaces	Git	1.16.17
copilot	Git	1.176.792
copilot-chat	Git	0.14.2024032701
remotehub	Git	0.63.2024031101
vscode-drawio	hed	1.6.6
fluent-icons	mig	0.0.18
vscode-language-pack-es	MS-	1.88.2024032709
vscode-language-pack-fr	MS-	1.88.2024032709
vscode-language-pack-pt-BR	MS-	1.88.2024032709
remote-containers	ms-	0.353.0
remote-ssh	ms-	0.111.2024032715
remote-ssh-edit	ms-	0.86.0
remote-wsl	ms-	0.88.0
azure-repos	ms-	0.39.2024031101
hexeditor	ms-	1.9.14
remote-explorer	ms-	0.5.2024031109
remote-repositories	ms-	0.41.2024022202
remote-server	ms-	1.6.2024032709
vscode-github-issue-notebooks	ms-	0.0.130
color-highlight	nau	2.8.0
material-icon-theme	PKi	4.34.0
excalidraw-editor	pom	3.7.3
vscode-yaml	red	1.14.0
vscode-sort-json	ric	1.20.0
luna-paint	Tyr	0.16.0

(3 theme extensions excluded)

[manav014]

I would like to work on this. Can anyone please assign this to me.

[manav014]

Hey @mjbvz I have created a PR that will fix this issue. Would be great if you can review the PR.