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Fix unwrap panic in next_boundary() (#137)

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Lines changed: 5 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -694,8 +694,11 @@ impl GraphemeCursor {`
`694`	`694`	`ifself.offset ==self.len{`
`695`	`695`	`returnOk(None);`
`696`	`696`	`}`
`697`		`-letmut iter = chunk[self.offset - chunk_start..].chars();`
`698`		`-letmut ch = iter.next().unwrap();`
	`697`	`+letmut iter = chunk[self.offset.saturating_sub(chunk_start)..].chars();`
	`698`	`+letmut ch =match iter.next(){`
	`699`	`+Some(ch) => ch,`
	`700`	`+None =>returnErr(GraphemeIncomplete::NextChunk),`
	`701`	`+};`
`699`	`702`	`loop{`
`700`	`703`	`ifself.resuming{`
`701`	`704`	`ifself.cat_after.is_none(){`

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