IntelliSense in HTML style attribute doesn't automatically popup

[yume-chan]

• VSCode Version: Code - Insiders 1.16.0-insider (0626479, 2017-08-21T07:17:17.874Z)
• OS Version: Windows_NT x64 10.0.15063
• Extensions:

Extension	Author (truncated)	Version
markdown-preview-github-styles	bie	0.0.2
path-intellisense	chr	1.4.2
ts-tslint	eg2	0.0.4
ejs	Sim	0.0.1
glslx-vscode	eva	0.0.11
easy-less	mrc	1.4.5
mssql	ms-	1.1.0
typescript-javascript-grammar	ms-	0.0.23
debugger-for-chrome	msj	3.1.8
vetur	oct	0.9.5
vscode-icons	rob	7.12.0
markdown-all-in-one	yzh	0.8.3

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Steps to Reproduce:

1. Create a HTML file.
2. Type <div style=""></div, put cursor in the style attribute.
3. Type anything.

Expected Result:

IntelliSense suggests CSS properties should automatically popup.

Actual Result:

I need to press Ctrl+Space to show IntelliSense.

Reproduces without extensions: Yes

[yume-chan]

OK, I found that it's controlled by the editor.quickSuggestions setting.

But I really think there should be a special treating of the style attribute.

[yume-chan]

It's another case of #23962