Keep a chain with length chain_one_line_max in a single line
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@ -176,7 +176,7 @@ pub fn rewrite_chain(expr: &ast::Expr, context: &RewriteContext, shape: Shape) -
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.fold(0, |a, b| a + first_line_width(b)) + parent_rewrite.len();
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let one_line_len = rewrites.iter().fold(0, |a, r| a + r.len()) + parent_rewrite.len();
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let veto_single_line = if one_line_len > context.config.chain_one_line_max - 1 {
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let veto_single_line = if one_line_len > context.config.chain_one_line_max {
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if rewrites.len() > 1 {
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true
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} else if rewrites.len() == 1 {
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