int AdjustForTabs(const String& text, int col, int tabSize) {
	int pos = 1;
	
	for (int i = 0; i < text.GetLength(); i++) {
		if (text[i] == '\t') {
			int newpos = (pos + tabSize - 1) / tabSize * tabSize + 1;
			col -= newpos - pos - 1;
			pos = newpos;
		}
		else
			pos++;
	}
	
	return col;
}

String text = editor.GetUtf8Line(line);
col = AdjustForTabs(text, col, settings.TabSize);