Bug: Field comments don't work with tabs.

[hamarb123]

Version Used: VS 17.9.5, roslyn 4.9.0-3.24121.1 (a98c90d); AND VS 17.10.0 Preview 3.0, roslyn 4.10.0-3.24202.15 (cbca41c).

Steps to Reproduce:

1. Make a c# class library project.
2. Put this in the .editorconfig for the solution:

[*.cs]
dotnet_diagnostic.IDE0055.severity = error
indent_style = tab

3. Put this in a c# file:

namespace ClassLibrary1
{
	public enum Class1
	{
		a, //a
		//b,
		c,
	}
}

(make sure it uses tabs, and not spaces)

Diagnostic Id:

IDE0055 fix formatting. (move //b, to align with //a)

Expected Behavior:

No diagnostic.

Actual Behavior:

Error.

Additional information:

See #29482 for the feature request

Also, if you replace the tabs with spaces, and update the .editorconfig appropriately, you get no error (as per the original feature request) - it only occurs with tabs.

This is a blocker for me with enabling proper formatting rules in my projects.

/cc @CyrusNajmabadi who was discussing this with me on discord

[sharwell]

@CyrusNajmabadi I'm not able to find a reference to the pull request(s) where #29482 or #65247 were fixed. Can you help with that?