Range GetNextPrevBookmark(Range range, bool next, bool selecting)
{
int index;
if (next)
{
index = Bookmarks.BinaryFindFirst(r => r.Start > range.Cursor);
if (index == -1)
{
index = 0;
}
}
else
{
index = Bookmarks.BinaryFindLast(r => r.Start < range.Cursor);
if (index == -1)
{
index = Bookmarks.Count - 1;
}
}
return(MoveCursor(range, Bookmarks[index].Start, selecting));
}