Output is not sorted by line numbers

```
509: bsc#1098394 -> - Fix file.get_diff regression on 2018.3 (bsc#1098394)
526: bsc#1098394 -> - Fix file.managed binary file utf8 error (bsc#1098394)
4093: bsc#565656565 -> - uploaded to salt 1.12.0 (bsc#565656565, bsc#676767676)
4093: bsc#676767676 -> - uploaded to salt 1.12.0 (bsc#565656565, bsc#676767676)
14: fate#1234 -> fate#1234
```

The output should be sorted afterwards and not start again with the next regex.

Start by locating the Go code that processes the changelog matches and assembles the displayed output. Reproduce the example, then inspect how results from successive regular expressions are combined; done means the final lines are sorted numerically by line number rather than restarting with each regex.

Written by the indexing model from the issue text.