private async Task <Solution> GetSolutionFixesAsync(FixAllContext fixAllContext, ImmutableArray <Document> documents)
        {
            var documentDiagnosticsToFix = await FixAllContextHelper.GetDocumentDiagnosticsToFixAsync(fixAllContext).ConfigureAwait(false);

            Solution solution = fixAllContext.Solution;
            List <Task <SyntaxNode> > newDocuments = new List <Task <SyntaxNode> >(documents.Length);

            foreach (var document in documents)
            {
                ImmutableArray <Diagnostic> diagnostics;
                if (!documentDiagnosticsToFix.TryGetValue(document, out diagnostics))
                {
                    newDocuments.Add(document.GetSyntaxRootAsync(fixAllContext.CancellationToken));
                    continue;
                }

                newDocuments.Add(this.FixAllInDocumentAsync(fixAllContext, document, diagnostics));
            }

            for (int i = 0; i < documents.Length; i++)
            {
                var newDocumentRoot = await newDocuments[i].ConfigureAwait(false);
                if (newDocumentRoot == null)
                {
                    continue;
                }

                solution = solution.WithDocumentSyntaxRoot(documents[i].Id, newDocumentRoot);
            }

            return(solution);
        }
        private async Task <Document> GetDocumentFixesAsync(FixAllContext fixAllContext)
        {
            var documentDiagnosticsToFix = await FixAllContextHelper.GetDocumentDiagnosticsToFixAsync(fixAllContext).ConfigureAwait(false);

            ImmutableArray <Diagnostic> diagnostics;

            if (!documentDiagnosticsToFix.TryGetValue(fixAllContext.Document, out diagnostics))
            {
                return(fixAllContext.Document);
            }

            var newRoot = await this.FixAllInDocumentAsync(fixAllContext, fixAllContext.Document, diagnostics).ConfigureAwait(false);

            if (newRoot == null)
            {
                return(fixAllContext.Document);
            }

            return(fixAllContext.Document.WithSyntaxRoot(newRoot));
        }