[gimp-web/testing] Start the GIMP 2.10.6 news.

[Jehan <jehanp src gnome org>]

commit fc4f6f37401976f0275a106b77963ede6641222a
Author: Jehan <jehan girinstud io>
Date:   Sun Aug 12 12:59:42 2018 +0200

    Start the GIMP 2.10.6 news.
    
    Screenshots are not made yet. In progress.
    Please help me to complete the GEGL/babl section and the space invasion!

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+Title: GIMP 2.10.6 Released
+Date: 2018-08-12
+Category: News
+Authors: Jehan Pagès
+Slug: gimp-2-10-6-released
+Summary: GIMP 2.10.6 released with vertical text layers, faster previews, Marathi translation, and more!
+Status: Draft
+
+A bit more than 3 months passed since [GIMP 2.10.0 release][], and this
+is already the fourth version in the series, bringing you bug fixes,
+optimizations and new features. Nothing will stop us!
+
+[GIMP 2.10.0 release]: https://www.gimp.org/news/2018/04/27/gimp-2-10-0-released/
+
+The most notable changes are listed below (see also the [NEWS][] file).
+
+[NEWS]: https://gitlab.gnome.org/GNOME/gimp/blob/3bbebaf6e06229ac893c1d4a34295a156ab28a06/NEWS#L11
+
+# Main changes
+## Vertical text layers
+
+GIMP finally has core support for vertical text (text-to-bottom
+writing)! This is a particularly awaited feature for several
+[East-Asian languages][], commonly written vertically, but also for
+anyone wishing to design fancy vertical text.
+
+<figure>
+<img src="{attach}gimp-2-10-6-vertical-text.png" alt="Vertical text">
+<figcaption>
+Vertical text in GIMP 2.10.6. TODO
+</figcaption>
+</figure>
+
+For this reason, GIMP provides several variants of vertical text, with
+mixed orientation (as is typical in East-Asian vertical writing) or
+upright orientation (more common for Western vertical writing), with
+right-to-left, as well as left-to-right columns.
+
+Thanks to Yoshio ONO for the vertical text implementation!
+
+[East-Asian languages]: https://en.wikipedia.org/wiki/Horizontal_and_vertical_writing_in_East_Asian_scripts
+
+## New "Little Planet" filter.
+
+A new filter makes an entrance: Little Planet (based on `gegl:stereographic-projection` operation).
+
+<figure>
+<img src="{attach}gimp-2-10-6-little-planet.png" alt="Little Planet filter">
+<figcaption>
+Little Planet filter in GIMP 2.10.6. TODO
+</figcaption>
+</figure>
+
+## Improved "Straightening"
+
+A lot of people appreciated the new [Horizon Straightening][] feature
+added in GIMP 2.10.4. Yet many of you wanted vertical straightening as
+well. This is now possible.
+
+[Horizon Straightening]: 
https://www.gimp.org/news/2018/07/04/gimp-2-10-4-released/#simple-horizon-straightening
+
+<figure>
+<img src="{attach}gimp-2-10-6-vertical-straighten.png" alt="Vertical Straightening">
+<figcaption>
+Vertical straightening in GIMP 2.10.6. TODO
+</figcaption>
+</figure>
+
+In "auto" mode (the default), "Straightening" will snap to the smaller
+angle to decide for vertical or horizontal straightening. You can
+override this behavior by specifying which it should be.
+
+## Optimized drawable preview rendering
+
+Most creators with advanced layer usaged experienced it: with
+too many big layers in a big image, GIMP has trouble keeping up.
+Scrolling the layer list is slow, showing or hiding layers is slow.
+
+One of the main bottleneck was layer preview rendering taking over the
+interface responsiveness. Ell did again some miracles here by having
+most drawable previews render asynchronously.
+
+The only exception is layer group rendering, which cannot be rendered
+asynchronously at this time. For this reason, a settings was added in
+the Preference dialog to disable preview of layer groups. This settings
+is enabled by default.
+
+<figure>
+<img src="{attach}gimp-2-10-6-layer-group-preview.png" alt="Disable preview of layer groups">
+<figcaption>
+Disable preview of layer groups in GIMP 2.10.6. TODO
+</figcaption>
+</figure>
+
+Let's also note that the Dashboard dockable ([introduced in GIMP
+2.10.0][]) now displays the number of async operations running, in the
+"Misc" group.
+
+[introduced in GIMP 2.10.0]: 
https://www.gimp.org/news/2018/03/26/gimp-2-10-0-rc1-released/#dashboard-dockable
+
+## A new language: Marathi
+
+GIMP was already translated in 80 languages. Well it's now [81
+languages][]!
+
+A team from the *North Maharashtra University*, Jalgaon, worked on a
+[Marathi][] translation, and contributed a [nearly full translation][]
+of GIMP.
+
+Of course, we should not forget all the other translators who do a
+wonderful work on GIMP. In this release, 12 other translations were
+updated: Brazilian Portuguese, Dutch, French, German, Greek, Italian,
+Latvian, Polish, Romanian, Slovenian, Spanish and Swedish.
+
+Thanks everyone!
+
+[81 languages]: https://l10n.gnome.org/module/gimp/#gimp-2-10
+[Marathi]: https://en.wikipedia.org/wiki/Marathi_language
+[nearly full translation]: https://l10n.gnome.org/languages/mr/gnome-gimp/ui/
+
+<figure>
+<img src="{attach}gimp-2-10-6-marathi-gimp.png" alt="GIMP in Marathi">
+<figcaption>
+Marathi translation in GIMP 2.10.6. TODO
+</figcaption>
+</figure>
+
+## File dialog filtering simplified
+
+A common cause of confusion in the file dialogs (opening, saving,
+exporting…) was the presence of 2 file format lists, one for displaying
+specific files per extensions, the other for the actual format choice.
+
+We simplified this interface by only showing a single list with both
+functions. A checkbox makes its apparition, allowing to display the full
+list of files (for instance when you want to force a format on a file
+using an unusual extension).
+
+<figure>
+<img src="{attach}gimp-2-10-6-file-dialog.png" alt="File Dialog">
+<figcaption>
+File dialog in GIMP 2.10.6. TODO
+</figcaption>
+</figure>
+
+# GEGL and babl
+
+# Ongoing Development
+
+TODO: space invasion
+
+TODO: extensions