src/vs/editor/contrib/codelens/codelensController.ts/CodeLensContribution/_getLayoutInfo
class CodeLensContribution:	private _getLayoutInfo() {
		let fontSize = this._editor.getOption(EditorOption.codeLensFontSize);
		let codeLensHeight: number;
		if (!fontSize || fontSize < 5) {
			fontSize = (this._editor.getOption(EditorOption.fontSize) * .9) | 0;
			codeLensHeight = this._editor.getOption(EditorOption.lineHeight);
		} else {
			codeLensHeight = (fontSize * Math.max(1.3, this._editor.getOption(EditorOption.lineHeight) / this._editor.getOption(EditorOption.fontSize))) | 0;
		}
		return { codeLensHeight, fontSize };
	}