Debug.Assert hit in TriviaDataFactory.cs

[JoeRobich]

I frequently use a debug build of the Roslyn LSP and am repeatedly hitting this failing Assert.

roslyn/src/Workspaces/SharedUtilitiesAndExtensions/Compiler/CSharp/Formatting/Engine/Trivia/TriviaDataFactory.cs

Lines 78 to 84 in 119402d

	var result = Analyzer.Between(token1, token2);
	var info = GetWhitespaceOnlyTriviaInfo(token1, token2, result);
	if (info != null)
	{
	Debug.Assert(string.IsNullOrWhiteSpace(this.TreeInfo.GetTextBetween(token1, token2)));
	return info;
	}

From exploring in the immediate window we see the problem is a zero-width space.

this.TreeInfo.GetTextBetween(token1, token2)
"\r\n\r\n"
string.IsNullOrWhiteSpace(this.TreeInfo.GetTextBetween(token1, token2))
false
this.TreeInfo.GetTextBetween(token1, token2).Length
5
this.TreeInfo.GetTextBetween(token1, token2)[0]
13 '\r'
this.TreeInfo.GetTextBetween(token1, token2)[1]
10 '\n'
this.TreeInfo.GetTextBetween(token1, token2)[2]
13 '\r'
this.TreeInfo.GetTextBetween(token1, token2)[3]
10 '\n'
this.TreeInfo.GetTextBetween(token1, token2)[4]
65279 ''