VSTHRD010 for callers of method that switches to main thread #993

        private void UpdateColoursFromFontsAndColors()
        {
            ThreadHelper.JoinableTaskFactory.Run(async () =>
            {
                await ThreadHelper.JoinableTaskFactory.SwitchToMainThreadAsync();
                var success = fontAndColorStorage.OpenCategory(ref categoryWithCoverage, storeFlags);
                if (success == VSConstants.S_OK)
                {
                    CoverageTouchedArea = GetColor("Coverage Touched Area");
                    CoverageNotTouchedArea = GetColor("Coverage Not Touched Area");
                    CoveragePartiallyTouchedArea = GetColor("Coverage Partially Touched Area");
                }
                fontAndColorStorage.CloseCategory();
                //throw ?
                requiresFromFontsAndColours = false;
            });
            
        }

        private System.Windows.Media.Color GetColor(string displayName)
        {
            ThreadHelper.ThrowIfNotOnUIThread();
            var touchAreaInfo = new ColorableItemInfo[1];
            var getItemSuccess = fontAndColorStorage.GetItem(displayName, touchAreaInfo);
            if (getItemSuccess == VSConstants.S_OK)
            {
                return ParseColor(touchAreaInfo[0].crBackground);
            }
            throw new Exception("Failed to get color");
        }