message: fix(common): Fix handling of input source maps
diff: @@ -1145,11 +1145,10 @@ impl SourceMap {
  if let Some(orig) = orig {
  for src in orig.sources() {
  - let idx = builder.add_source(src);
  - src_id = idx as u32 + 1;
  - }
  - for (idx, contents) in orig.source_contents().enumerate() {
  - builder.set_source_contents(idx as _, contents);
  + let id = builder.add_source(src);
  + src_id = id as u32 + 1;
  +
  + builder.set_source_contents(id, orig.get_source_contents(id));
  }
  }
  