Use of `general.ignore` is not merged with `ignore-by-author-name.ignore`

[CarrotManMatt]

I would make an expectation that any rules listed under general.ignore will be ignored in every circumstance. However I have identified that if a commit's author matches ignore-by-author-name.regex then only the rules in ignore-by-author-name.ignore are ignored.

Steps to reproduce

1. Use the following configuration:

[general]
ignore = B6
regex-style-search = True

[ignore-by-author-name]
regex = \A.*\[bot\].*\Z
ignore = T1,B1

2. Make a commit with author name renovate[bot] and commit message This is a test0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
3. Identify that rule T1 (title too long) is successfully ignored, yet rule B6 (missing body )is not ignored, despite it being present in general.ignore

Current workaround

Duplicate any ignored rule identifiers/names that are listed within general.ignore to ignore-by-author-name.ignore so that the rules are ignored under all circumstances.

Requested solution

Merge all necessary ignore fields (including ignore-by-body.ignorr & ignore-by-title.ignore) with general.ignore to remove the need to duplicate requested ignored rules.