Commit fbdab5c

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Add test to ensure it works when double-width and signle-width are mixed

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Original file line number	Diff line number	Diff line change
`@@ -645,3 +645,31 @@ fn test_point_to_double_width_characters_multiple() {`
`645`	`645`
`646`	`646`	`assert_eq!(DisplayList::from(snippets).to_string(), expected);`
`647`	`647`	`}`
	`648`	`+`
	`649`	`+#[test]`
	`650`	`+fn test_point_to_double_width_characters_mixed() {`
	`651`	`+ let snippets = Snippet {`
	`652`	`+ slices: vec![snippet::Slice {`
	`653`	`+ source: "こんにちは、新しいWorld!",`
	`654`	`+ line_start: 1,`
	`655`	`+ origin: Some("<current file>"),`
	`656`	`+ annotations: vec![snippet::SourceAnnotation {`
	`657`	`+ range: (6, 14),`
	`658`	`+ label: "New world",`
	`659`	`+ annotation_type: snippet::AnnotationType::Error,`
	`660`	`+ }],`
	`661`	`+ fold: false,`
	`662`	`+ }],`
	`663`	`+ title: None,`
	`664`	`+ footer: vec![],`
	`665`	`+ opt: Default::default(),`
	`666`	`+ };`
	`667`	`+`
	`668`	`+ let expected = r#" --> <current file>:1:7`
	`669`	`+ \|`
	`670`	`+1 \| こんにちは、新しいWorld!`
	`671`	`+ \| ^^^^^^^^^^^ New world`
	`672`	`+ \|"#;`
	`673`	`+`
	`674`	`+ assert_eq!(DisplayList::from(snippets).to_string(), expected);`
	`675`	`+}`

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