Merge pull request #1655 from plone/upgrade-to-61

Start Plone 6.1 upgrade guide

docs/backend/upgrading/version-specific-migration/index.md

@@ -26,5 +26,6 @@ upgrade-to-52
 upgrade-to-python3
 upgrade-zodb-to-python3
 upgrade-to-60
+upgrade-to-61
 migrate-to-volto
 ```

docs/backend/upgrading/version-specific-migration/upgrade-to-61.md

@@ -0,0 +1,88 @@
+---
+myst:
+  html_meta:
+    "description": "How to upgrade to Plone 6.1"
+    "property=og:description": "How to upgrade to Plone 6.1"
+    "property=og:title": "How to upgrade to Plone 6.1"
+    "keywords": "Upgrade, Plone 6"
+---
+
+(backend-upgrade-plone-v61-label)=
+
+# Upgrade Plone 6.0 to 6.1
+
+Plone 6.1 has seen the following major changes.
+Some may require changes in your setup.
+
+
+## Drop Python 3.8 and 3.9
+
+We only support Python 3.10, 3.11, and 3.12.
+
+
+## TinyMCE upgraded in Classic UI
+
+In Plone 6.0, the Classic UI frontend uses TinyMCE 5, a rich text editor for websites.
+TinyMCE 5 reached its end of support on April 20, 2023.
+For Plone 6.1, Classic UI upgraded TinyMCE from version 5 to 7.
+
+If you upgrade a site using Classic UI from Plone 6.0 to 6.1, you do not need to take any action, unless you implemented custom plugins, or you use a plugin which got removed or moved to premium in TinyMCE versions 6 or 7.
+To upgrade your plugin implementation to TinyMCE 7, see the [upgrade guides](https://www.tiny.cloud/docs/tinymce/6/migration-from-5x/#plugins).
+
+
+### Enable the TinyMCE accordion plugin
+
+1.  Go to the {guilabel}`Site Setup > General > TinyMCE` control panel to manage TinyMCE settings.
+1.  Under the {guilabel}`Plugins and Toolbar` tab, check {guilabel}`accordion` to enable the accordion plugin.
+1.  Under the same tab, add a menu entry `accordion` for TinyMCE in the control panel by editing the `items` key as shown.
+
+    ```json
+    {
+      "insert": {
+        "title": "Insert",
+        "items": "link media | template hr | accordion"
+      },
+    }
+    ```
+
+1.  Click the {guilabel}`Save` button to save your settings.
+1.  In the {guilabel}`Security > HTML filtering` control panel, add two new tags to {guilabel}`Valid tags`.
+
+    -   `summary`
+    -   `details`
+
+1.  Also in the {guilabel}`Security > HTML filtering` control panel, add a new attribute to {guilabel}`Custom attributes`.
+
+    -   `open`
+
+1.  For a transform to valid markup of the Bootstrap 5 accordion, use an output filter.
+
+    ```{seealso}
+    -   [Addon collective.outputfilters.tinymceaccordion](https://github.com/collective/collective.outputfilters.tinymceaccordion)
+    ```
+
+
+## `z3c.form` and `plone.app.z3cform`
+
+````{todo}
+This is a placeholder.
+
+-   Update deprecated imports
+-   New widget templates
+
+```{seealso}
+https://github.com/plone/plone.app.z3cform/pull/181
+```
+````
+
+
+## `plone.app.multilingual` is a core add-on
+
+`plone.app.multilingual` is the package that adds multilingual support to Plone, allowing the storage and display of content in multiple languages.
+In Plone 6.0 and earlier, this was a dependency of `Products.CMFPlone`, making it available for installation in all Plone sites.
+In Plone 6.1 it is now a dependency of the `Plone` package.
+
+If your project or your add-on needs this package, and you only depend on `Products.CMFPlone` until now, you should add `plone.app.multilingual` as a dependency.
+Then your project or add-on will keep working in both Plone 6.0 and 6.1.
+
+The goal of turning more of the current core packages into core add-ons is to make the core smaller, and in some cases solve circular dependencies.