editor.formatOnType does not respect editor.insertSpaces setting

[j-h-a]

• VSCode Version:
  1.6.1
• OS Version:
  OSX (10.11.6)

Searchable description

VS Code keeps changing some lines to have spaces instead of tabs in the leading whitespace.

Steps to Reproduce:

Use these settings:
"editor.tabSize": 4,
"editor.insertSpaces": false,
"editor.detectIndentation": false,
"editor.formatOnType": true,

Type some code that triggers formatOnType to activate a format change.

Expected behaviour:

Line is formatted using tabs for leading whitespace, because of the insertSpaces setting.

Actual behaviour:

Line is formatted with spaces instead of tabs for the leading whitespace.

[roblourens]

Is this in an html file? Could be #13563

[j-h-a]

No, this is while editing C#

[roblourens]

Related @aeschli?

[aeschli]

This issue was moved to dotnet/vscode-csharp#834