Contributed snippet not working in embedded language

[octref]

• VSCode Version: Code 1.9.1 (f9d0c68, 2017-02-08T23:31:51.320Z)
• OS Version: Darwin x64 15.6.0
• Extensions:

Extension	Author	Version
concrete	vscode	0.1.10
vscode-eslint	dbaeumer	1.2.6
tslint	eg2	0.8.1
Theme-TomorrowKit	ms-vscode	0.1.3
debugger-for-chrome	msjsdiag	2.5.3
vetur	octref	0.3.6
vuehelper	oysun	0.0.9
vscode-icons	robertohuertasm	7.2.0
language-stylus	sysoev	1.6.0
vim	vscodevim	0.5.3

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1. Install an extension that contributes js snippets
2. Try using it in <script> region in a html file
3. Snippet won't be suggested.

However, if the snippet is in user-defined javascript.json, it'll be prompted when editing <script> region.

[octref]

Probably should go to @jrieken.

[jrieken]

Yes, the language isn't known yet because no file of it, just embedded content, has been opened yet. Because we lazy load languages and their snippets this happens...