src/vs/editor/browser/widget/codeEditorWidget.ts/CodeEditorWidget/getOffsetForColumn
class CodeEditorWidget:	public getOffsetForColumn(lineNumber: number, column: number): number {
		if (!this._modelData || !this._modelData.hasRealView) {
			return -1;
		}
		return this._modelData.view.getOffsetForColumn(lineNumber, column);
	}