Optimize RTE page (#398)

Main point it to add examples for setting a preset via page TSconfig.

Additionally, the following changes are made:

- add a header for the examples (since examples are now extended
  and this improves finding the examples when skimming the page)
- add clarification what "order" (for the presets) means. If not
  familiar with TYPO3 one might assume, the order means that the
  later settings overrides the previous which is not the case:
  once a setting is set, the ones following it are ignored.
- clarify what default (number 4. in the listing of "order")
  means
- add some links

Documentation/PageTsconfig/Rte.rst

@@ -13,12 +13,15 @@ The `RTE` prefix key is used for configuration of the Rich Text Editor.
 Please refer to the :ref:`RTE chapter <t3coreapi:rte>` in Core API document
 for more general information on RTE configuration and data processing.
 
-The order in which configuration for the RTE is loaded is:
+The order in which the configuration for the RTE is loaded is (the first one which
+is set will be used, see :ref:`example <pageTsRteOverridePreset>` below):
 
-1. preset defined for a specific field via PageTS
-2. richtextConfiguration defined for a specific field via TCA
-3. general preset defined via PageTS
-4. default
+1. preset defined for a specific field via page TSconfig
+2. :ref:`richtextConfiguration <t3tca:columns-text-properties-richtextConfiguration>`
+   defined for a specific field via TCA
+3. general preset defined via page TSconfig (:typoscript:`RTE.default.preset`)
+4. default (the preset "default", e.g. as defined by EXT:rte_ckeditor or overridden
+   in :file:`ext_localconf.php`)
 
 The full property path building is a bit more complex than for other
 property segments. The goal is that global options can be set that can
@@ -33,7 +36,17 @@ Configure RTE for a specific field in a table
 Configure RTE for a specific field in a table for a specific :ref:`record type <t3tca:types>`
     `RTE.config.[tableName].[fieldName].types.[type]`
 
-Consider the following Page TSconfig examples:
+Configuring RTE via page TSconfig is general and not specific to a
+particular rich-text editor. However, TYPO3 comes with EXT:rte_ckeditor, so this one
+will usually be used. This page covers only the general configuration, for
+more information about configuring EXT:rte_ckeditor, see the
+:ref:`rte_ckeditor configuration <ext_rte_ckeditor:configuration>`.
+
+Examples
+========
+
+Example: Disable RTE
+--------------------
 
 .. code-block:: typoscript
    :caption: EXT:site_package/Configuration/page.tsconfig
@@ -59,6 +72,30 @@ Consider the following Page TSconfig examples:
    # But disable RTE for tt_content bodytext again if the record type is "text"
    RTE.config.tt_content.bodytext.types.text.disabled = 1
 
+.. _pageTsRteOverridePreset:
+
+Example: Override preset
+------------------------
+
+Refer to the description of the order above for details of which setting has priority over which.
+
+Summary:
+
+*   Setting the preset via page TSconfig *for a specific field* overrides all,
+    else
+*   TCA richtextConfiguration (for a specific field) overrides the page TSconfig
+    default preset (:typoscript:`RTE.default.preset`)
+
+.. code-block:: typoscript
+    :caption: EXT:site_package/Configuration/page.tsconfig
+
+    # set a default preset to use as fallback
+    RTE.default.preset = custom_preset_default
+
+    # Override preset for field "description" in table "tt_address"
+    RTE.config.tt_address.description.preset = custom_preset_fancy
+
+
 Properties
 ==========
 

Documentation/Settings.cfg

@@ -58,7 +58,7 @@ ext_lowlevel       = https://docs.typo3.org/c/typo3/cms-lowlevel/main/en-us/
 # ext_recycler       = https://docs.typo3.org/c/typo3/cms-recycler/main/en-us/
 # ext_redirects      = https://docs.typo3.org/c/typo3/cms-redirects/main/en-us/
 # ext_reports        = https://docs.typo3.org/c/typo3/cms-reports/main/en-us/
-# ext_rte_ckeditor   = https://docs.typo3.org/c/typo3/cms-rte-ckeditor/main/en-us/
+ext_rte_ckeditor   = https://docs.typo3.org/c/typo3/cms-rte-ckeditor/main/en-us/
 # ext_scheduler      = https://docs.typo3.org/c/typo3/cms-scheduler/main/en-us/
 # ext_seo            = https://docs.typo3.org/c/typo3/cms-seo/main/en-us/
 # ext_t3editor       = https://docs.typo3.org/c/typo3/cms-t3editor/main/en-us/