[BB-6151] feat: upgrades tinyMCE v4.0.20 to tinyMCE v5.5.1

cms/envs/common.py

@@ -1295,14 +1295,14 @@
     'style-vendor-tinymce-content': {
         'source_filenames': [
             'css/tinymce-studio-content-fonts.css',
-            'js/vendor/tinymce/js/tinymce/skins/studio-tmce4/content.min.css',
+            'js/vendor/tinymce/js/tinymce/skins/ui/studio-tmce5/content.min.css',
             'css/tinymce-studio-content.css'
         ],
         'output_filename': 'css/cms-style-vendor-tinymce-content.css',
     },
     'style-vendor-tinymce-skin': {
         'source_filenames': [
-            'js/vendor/tinymce/js/tinymce/skins/studio-tmce4/skin.min.css'
+            'js/vendor/tinymce/js/tinymce/skins/ui/studio-tmce5/skin.min.css'
         ],
         'output_filename': 'css/cms-style-vendor-tinymce-skin.css',
     },

cms/templates/maintenance/_announcement_edit.html

@@ -36,13 +36,15 @@ <h3 class="info-course">
   <script type="text/javascript">
       tinymce.init({
           selector: "#id_content",
+          height: 450,
+          skin: "studio-tmce5",
           branding: false,
           plugins: [
               "advlist autolink lists link image charmap print anchor",
               "searchreplace visualblocks code",
               "insertdatetime media table contextmenu paste"
           ],
-          toolbar: "undo redo | styleselect | bold italic | alignleft aligncenter alignright alignjustify | bullist numlist outdent indent | link image"
+          toolbar: "undo redo styleselect bold italic alignleft aligncenter alignright alignjustify bullist numlist outdent indent link image"
       });
   </script>
 </%block>

common/static/js/vendor/tinymce/BUILD_README.md

@@ -0,0 +1,53 @@
+# Instructions for updating tinymce to a newer version:
+
+1. Download the desired version from https://github.com/tinymce/tinymce/tags
+2. If it’s a major update, follow the official migration doc and update the codebase as needed.
+3. Setup the codemirror-plugin as per the instruction below.
+4. Find all the EDX specific changes in the currently used version of tinymce by searching for the string "EDX" in the vendor/js/tinymce dir.
+5. Merge the EDX specific changes with the newly downloaded version.
+6. Follow the instructions given below to create the new version of js/tinymce.full.min.js
+
+# Instruction for setting codemirror-plugin
+
+1. Download the tinymce-codemirror-plugin from https://gitlab.com/tinymce-plugins/tinymce-codemirror
+2. Open terminal in the downloaded plugin directory and run the following commands:
+    ```
+     npm install
+     npm run prepublish (This command will generate the minified file in the plugin directory)
+    ```
+3. Remove the tinymce-codemirror/plugins/codemirror/codemirror-4.8 directory
+4. Move the tinymce-codemirror/plugins directory to `common/static/js/vendor/tinymce/js/plugins/` directory.
+5. Apply EDX specific changes in the existing code to the `plugin.js` and `source.html` files.
+6. Install [uglify-js](https://www.npmjs.com/package/uglify-js) and generate `plugin.min.js`
+    ```
+    cd common/static/js/vendor/tinymce/js/plugins/codemirror/
+    uglify plugin.js -m -o plugin.min.js
+    ```
+**IMPORTANT NOTE:** Regenerate the `tinymce.full.min.js` bundle everytime the code-mirror `plugin.min.js` is regenerated to ensure the latest changes are added to the bundle.
+
+# Instructions for creating js/tinymce.full.min.js
+
+The following uses the version 5.5.1 as a reference. Change your filenames depending the version you have downloaded.
+
+1. Unzip the zip file downloaded from Github.
+    ```
+    unzip tinymce-5.5.1.zip
+    ```
+2. Open terminal and change directory to the newly downloaded tinymce.
+    ```
+    cd tinymce-5.5.1
+    ```
+3. Build TinyMCE using Yarn. this will create multiple zip files in the `dist` directory.
+    ```
+    yarn && yarn build
+    ```
+4. Unzip the dev bundle to the edx-platform's vendor directory.
+    ```
+    unzip dist/tinymce_5.5.1_dev.zip -d /path/to/edx-platform/common/static/js/vendor/
+    ```
+5. Remove the unnecessary files in `/path/to/edx-platform/common/static/js/vendor/tinymce` like `package.json`, `yarn.lock`...etc.,
+6. Generate a bundled version of the TinyMCE with all the plugins using the following command
+    ```
+    cd common/static/js/vendor/tinymce/js/tinymce
+    LC_ALL=C cat tinymce.min.js */*/*.min.js plugins/emoticons/js/emojis.min.js > tinymce.full.min.js
+    ```