Put imports list on the next line if it exceeds max width

Author: topecongiro

src/imports.rs

@@ -366,7 +366,8 @@ fn rewrite_nested_use_tree(
     };
     let list_str = write_list(&items[first_index..], &fmt)?;
 
-    let result = if list_str.contains('\n') && context.config.imports_indent() == IndentStyle::Block
+    let result = if (list_str.contains('\n') || list_str.len() > remaining_width)
+        && context.config.imports_indent() == IndentStyle::Block
     {
         format!(
             "{}{{\n{}{}\n{}}}",