What is the difference between `matchLines` in `previewOptions` and `surroundingContext`?

[alexr00]

Testing #223154

export interface FindTextInFilesOptionsNew {
		...
		/**
		 * Options to specify the size of the result text preview.
		 */
		previewOptions?: {
			/**
			 * The maximum number of lines in the preview.
			 * Only search providers that support multiline search will ever return more than one line in the match.
			 */
			matchLines?: number;
...
		};

		/**
		 * Number of lines of context to include before and after each match.
		 */
		surroundingContext?: number;
	}

I don't understand the difference by reading the API doc. previewOptions sounds like it should be about the preview, not the match, but then it has a property called matchLines.

[andreamah]

I could maybe name it better. It says The maximum number of lines in the preview., but I guess matchLines sounds like it should be the number of lines to match.

[vs-code-engineering]

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