private static async Task <Document> RemoveRegionAsync(Document document, RegionDirectiveTriviaSyntax regionDirective, EndRegionDirectiveTriviaSyntax endRegionDirective, CancellationToken cancellationToken)
{
SourceText sourceText = await document.GetTextAsync(cancellationToken).ConfigureAwait(false);
int startLine = regionDirective.GetSpanStartLine();
int endLine = endRegionDirective.GetSpanEndLine();
TextLineCollection lines = sourceText.Lines;
TextSpan span = TextSpan.FromBounds(
lines[startLine].Start,
lines[endLine].EndIncludingLineBreak);
var textChange = new TextChange(span, "");
SourceText newSourceText = sourceText.WithChanges(textChange);
return(document.WithText(newSourceText));
}
