private void EnsureSelectionArrays(int textColumnIndex)
{
if (textColumnIndex < this._selectionStart.Length)
{
// There exists a text column for the given column index,
// so there's nothing to do here except happily return.
return;
}
// Add a new column index if needed.
var currentSelectionStarts = new List <int>(this._selectionStart);
var currentSelectionLengths = new List <int>(this._selectionStart);
var currentSelectionStyles = new List <ITextSegmentStyled>(this._textSegmentSelection);
for (var i = this._selectionStart.Length; i <= textColumnIndex; i++)
{
currentSelectionStarts.Add(0);
currentSelectionLengths.Add(0);
currentSelectionStyles.Add(TextDocument.CreateStyledTextSegment(this.GetTextStyle("Selection")));
}
this._selectionStart = currentSelectionStarts.ToArray();
this._selectionLength = currentSelectionLengths.ToArray();
this._textSegmentSelection = currentSelectionStyles.ToArray();
}