src/vs/editor/browser/view/viewController.ts/ViewController/_validateViewColumn
class ViewController:	private _validateViewColumn(viewPosition: Position): Position {
		const minColumn = this.viewModel.getLineMinColumn(viewPosition.lineNumber);
		if (viewPosition.column < minColumn) {
			return new Position(viewPosition.lineNumber, minColumn);
		}
		return viewPosition;
	}