TASK: Add changelog for 5.0.9

See https://jenkins.neos.io/job/neos-release/250/

Neos.Neos/Documentation/Appendixes/ChangeLogs/509.rst

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+`5.0.9 (2020-02-25) <https://github.com/neos/neos-development-collection/releases/tag/5.0.9>`_
+==============================================================================================
+
+Overview of merged pull requests
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+`BUGFIX: Flush content cache on image variant change <https://github.com/neos/neos-development-collection/pull/2910>`_
+----------------------------------------------------------------------------------------------------------------------
+
+If you access an image property in a node and render an ImageVariant
+from it via Fusion using an image variant preset, the cache is now
+flushed if the image variant is changed afterwards, e.g. when changing
+the crop in the media management module.
+
+Fixes #2897
+
+* Packages: ``Media`` ``Neos``
+
+`BUGFIX: Access tags of asset in media list view <https://github.com/neos/neos-development-collection/pull/2917>`_
+------------------------------------------------------------------------------------------------------------------
+
+This uses `assetProxy.asset.tags` instead of just `assetProxy.tags`
+as a simple way to fix the display of assigned tags in the media
+browser list view.
+
+Fixes neos/neos-development-collection#2350
+
+* Packages: ``Browser``
+
+`BUGFIX: Don't use AbstractValidator::$result in PasswordValidator <https://github.com/neos/neos-development-collection/pull/2909>`_
+------------------------------------------------------------------------------------------------------------------------------------
+
+PasswordValidator was using the property $result of AbstractValidaor. That caused an Error 500 since Flow 6, because AbstractValidator::$result is private now.
+
+
+**What I did**
+Changed to AbstractValidator::addError() method
+
+**How to verify it**
+Use The PasswordValidator with a minimumLength and try to produce a validation-error.
+
+* Packages: ``Neos``
+
+`TASK: Remove unused template <https://github.com/neos/neos-development-collection/pull/2912>`_
+-----------------------------------------------------------------------------------------------
+
+This code should have been removed when the `UsageController` was
+introduced in `ea7587374012b35d45d1c7402c43410353613f6d <https://github.com/neos/neos-development-collection/commit/ea7587374012b35d45d1c7402c43410353613f6d>`_.
+
+* Packages: ``Browser``
+
+`TASK: Remove unused code <https://github.com/neos/neos-development-collection/pull/2911>`_
+-------------------------------------------------------------------------------------------
+
+This code should have been removed when the `ImageVariantController`
+was introduced in `0aa2eed015e02a468f9b2e8e1d08f8275349edde <https://github.com/neos/neos-development-collection/commit/0aa2eed015e02a468f9b2e8e1d08f8275349edde>`_. Which
+means it should have never been there. ;)
+
+* Packages: ``Browser``
+
+`BUGFIX: Prevent double dash formatting in docs for node:repair command <https://github.com/neos/neos-development-collection/pull/2908>`_
+-----------------------------------------------------------------------------------------------------------------------------------------
+
+The readthedocs command reference formats double dashes
+as one long dash. Copying the command into the CLI will therefore
+not work properly as f.e. the node-type filter will not apply
+and all nodes are repaired.
+
+* Packages: ``Neos``
+
+`BUGFIX: Correct code blocks in documentation <https://github.com/neos/neos-development-collection/pull/2904>`_
+---------------------------------------------------------------------------------------------------------------
+
+* Packages: ``Media`` ``Neos``
+
+`TASK: Fix validation warnings/errors on .travis.yml <https://github.com/neos/neos-development-collection/pull/2901>`_
+----------------------------------------------------------------------------------------------------------------------
+
+Fixes build config validation complaints:
+
+- W jobs.include: deprecated key sudo (The key `sudo` has no effect anymore.)
+- W notifications.slack: unknown key on_start (never)
+- I root: missing os, using the default linux
+- I root: key matrix is an alias for jobs, using jobs
+
+* Packages: ``Browser`` ``Neos``
+
+`BUGFIX: Replace baseUri in cache identifiers <https://github.com/neos/neos-development-collection/pull/2898>`_
+---------------------------------------------------------------------------------------------------------------
+
+Since Flow 6.0 the httpRequest.baseUri is gone and we
+need to replace it in the cache identifiers to avoid wrong
+cache behavior.
+
+* Packages: ``Fusion``
+
+`BUGFIX: Add code migration for MultiColumn* nodetypes <https://github.com/neos/neos-development-collection/pull/2872>`_
+------------------------------------------------------------------------------------------------------------------------
+
+Add missing code migration for nodetypes Neos.NodeTypes:MultiColumn and Neos.NodeTypes:MultiColumnItem for seamless upgrade process.
+
+* Packages: ``Browser`` ``Neos`` ``NodeTypes``
+
+`BUGFIX: Convert DateTimeImmutable "Now" into DateTime for account deactivation <https://github.com/neos/neos-development-collection/pull/2859>`_
+-------------------------------------------------------------------------------------------------------------------------------------------------
+
+Convert "Now" based on DateTimeImmutable to DateTime, as Account::setExpirationDate expects it.
+
+Fixes #2131 
+
+* Packages: ``Neos``
+
+`TASK: Pass on previous exception in getImageSize() <https://github.com/neos/neos-development-collection/pull/2877>`_
+---------------------------------------------------------------------------------------------------------------------
+
+* Packages: ``Browser`` ``Media`` ``Neos``
+
+`BUGFIX: Respect arguments value as defined in Neos.Neos:NodeUri <https://github.com/neos/neos-development-collection/pull/2893>`_
+----------------------------------------------------------------------------------------------------------------------------------
+
+The prototype Neos.Neos:NodeUri defines `arguments = Neos.Fusion:RawArray`
+but this value is never processed in the PHP implementation.
+Instead, the additionalParams is processed and passed to
+the parameter `arguments` of the NodeLiking service.
+
+Now both parameters are used. `additionalParams` should be deprecated.
+
+* Packages: ``Browser`` ``Neos``
+
+`Bugfix: Use controller context to get FlashMessageContainer <https://github.com/neos/neos-development-collection/pull/2876>`_
+------------------------------------------------------------------------------------------------------------------------------
+
+Remove left over of rewrite FlashMessages.
+See: https://github.com/neos/flow-development-collection/pull/1061
+
+* Packages: ``Neos``
+
+`BUGFIX: xhr request in backend modules <https://github.com/neos/neos-development-collection/pull/2841>`_
+---------------------------------------------------------------------------------------------------------
+
+With Neos 5.0 the nodetypeschema endpoint was removed from the backend modules
+template but the request was still sent.
+Without the uri the current url of the module was instead requested.
+This caused other errors when using the backbutton of the browser when sometimes instead of the whole module only the json response was shown.
+
+This resolves: #2791 
+
+**What I did**
+
+Prevent the duplicate request
+
+**How I did it**
+
+Check if the endpoint uri exists before calling it.
+
+**How to verify it**
+
+Go to any module and check whether a xhr request is sent to the current url.
+
+
+* Packages: ``Browser`` ``Neos``
+
+`Detailed log <https://github.com/neos/neos-development-collection/compare/5.0.8...5.0.9>`_
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~