--TEST--

See Github issue #4795 ( github.com/composer/composer/issues/4795 ).

Composer\Installer::whitelistUpdateDependencies intentionally ignores root requirements even if said package is also a
dependency of one the requirements that is whitelisted for update.

--COMPOSER--
{
    "repositories": [
        {
            "type": "package",
            "package": [
                { "name": "a/a", "version": "1.0.0" },
                { "name": "a/a", "version": "1.1.0" },
                { "name": "b/b", "version": "1.0.0", "require": { "a/a": "~1.0" } },
                { "name": "b/b", "version": "1.1.0", "require": { "a/b": "~1.1" } }
            ]
        }
    ],
    "require": {
        "a/a": "~1.0",
        "b/b": "~1.0"
    }
}

--INSTALLED--
[
    { "name": "a/a", "version": "1.0.0" },
    { "name": "b/b", "version": "1.0.0", "require": { "a/a": "~1.0" } }
]

--LOCK--
{
    "packages": [
        { "name": "a/a", "version": "1.0.0" },
        { "name": "b/b", "version": "1.0.0", "require": { "a/a": "~1.0" } }
    ],
    "packages-dev": [],
    "aliases": [],
    "minimum-stability": "dev",
    "stability-flags": [],
    "prefer-stable": false,
    "prefer-lowest": false,
    "platform": [],
    "platform-dev": []
}
--RUN--
update b/b --with-dependencies

--EXPECT-OUTPUT--
<warning>Dependency "a/a" is also a root requirement, but is not explicitly whitelisted. Ignoring.</warning>
Loading composer repositories with package information
Updating dependencies
Nothing to modify in lock file
Writing lock file
Installing dependencies from lock file (including require-dev)
Nothing to install, update or remove
Generating autoload files

--EXPECT--