[RCS1260] False Positive

[Stuart Turner]

Product and Version Used:
Roslynator.Analyzers

Steps to Reproduce:
set .editorconfig values:

roslynator_trailing_comma_style = omit_when_single_line
dotnet_diagnostic.RCS1260.severity = warning

Actual Behavior:
Warning RCS1260 on the , at the end of Property1

var value = new Object
{
    Property1 = "Value"{|RCS1260:,|}
}

Expected Behavior:
No warning

var value = new Object
{
    Property1 = "Value",
}

Possible correction:

I believe the following code relies solely on the initializer.Expressions syntax node, when it should be based on the initializer code.

roslynator/src/Analyzers/CSharp/Analysis/AddOrRemoveTrailingCommaAnalyzer.cs

Line 67 in 7505ae8

 && expressions.IsSingleLine(cancellationToken: context.CancellationToken)) 

Other IsSingleLine() checks in this file need similar review.