[gimp-web] news: add a news item for 2.10.22 on macOS, and mention issues on Big Sur

[Michael Schumacher <schumaml src gnome org>]

commit a961e90e686805225fbe6b7f2b3f594c3627a777
Author: Michael Schumacher <schumaml gmx de>
Date:   Fri Dec 25 15:56:51 2020 +0100

    news: add a news item for 2.10.22 on macOS, and mention issues on Big Sur

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+Title: GIMP 2.10.22 Released for macOS
+Date: 2020-12-25
+Category: News
+Authors: Wilber
+Slug: gimp-2-10-22-released-macos
+Summary: "GIMP 2.10.22 available for macOS - and what is going on with Big Sur"
+Status: draft
+
+GIMP 2.10.22 is now available as a DMG file from our [downloads page](https://www.gimp.org/downloads).
+
+Many thanks to Des McGuinness, who updated the build enviroment created by
+Alex Samorukov and succeeded in getting the current stable code built and
+notarized!
+
+This brings all the changes and fixes since GIMP 2.10.14 to macOS users, who
+had been limited to this increasingly outdated version for far too long. Several
+of the changes are quite visible and noticable to users, so it is a good idea
+to check the release notes for GIMP
+[2.10.18](https://www.gimp.org/news/2020/02/24/gimp-2-10-18-released/),
+[2.10.20](https://www.gimp.org/news/2020/06/11/gimp-2-10-20-released/) and
+[2.10.22](https://www.gimp.org/news/2020/10/07/gimp-2-10-22-released/) to get up
+to date with the current versions.
+
+# What's going on with Big Sur
+
+It is not all well on the platform yet, though - with users upgrading to the
+latest macOS release, Big Sur, we started getting reports about performance and
+user interface issues.
+
+[GIMP being very slow](https://gitlab.gnome.org/GNOME/gimp/-/issues/5989) and [invisible selection
+outlines](https://gitlab.gnome.org/GNOME/gimp/-/issues/5952) are reported most
+frequently. It is likely both are symptoms of the same underlying technical
+issue, that being the image window content being updated completely and far too
+frequently than necessary.
+
+It feels really good to have active contributors to the macOS platform again,
+this gives us confidence that the issues can be investigated properly and,
+hopefully, mitigated or completely solved.
+
+Finally, please don't forget you can [donate to the project and personally
+fund several GIMP developers](https://www.gimp.org/donating/), as a way to
+give back and accelerate the development of GIMP.