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