FIX: Save WYSIWYG saving in source mode

Summary

See https://gitlab.indiscale.com/caosdb/customers/cfaed/management/-/issues/36. This fixes a bug whereby changes made in Source Mode of the WYSIWYG editor would not be saved.

Focus

Instead of listening to CKEditor's change:data event, we're now using the edit mode's state machine and its insert and update transitions to update the text areas that were replaced by the WYSIWYG editor.

Test Environment

Start any CaosDB server with the BUILD_MODULE_EXT_EDITMODE_WYSIWYG_TEXT build property enabled. Verify that changes made in a text property using the WYSIWYG editor are now saved correctly both within and outside Source Editing after clicking save. Also test this with records that have multiple text properties.

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src/core/js/ext_editmode_wysiwyg_text.js

@@ -67,7 +67,28 @@ var ext_editmode_wysiwyg_text = function ($, logger, ClassicEditor, edit_mode, g
                 editor.updateSourceElement();
             });
             // TODO(fspreck): Add an event listener to save also changes made in
-            // source mode. What event can we listen to?
+            // source mode. What event can we listen to? The following doesn't
+            // work either.
+            // document.body.addEventListener("input", e => {
+            //     console.log("Saving after input...");
+            //     editor.updateSourceElement();
+            // }, true);
+            const sourceEditingPlugin = editor.plugins.get("SourceEditing");
+            sourceEditingPlugin.on("change:isSourceEditingMode", (e, name, isSourceEditingMode) => {
+                if (isSourceEditingMode) {
+                    // Maybe this helps?
+                    console.log("Entering source editing");
+                    const [domSourceEditingElementWrapper] = sourceEditingPlugin._replacedRoots.values();
+                    const textarea = domSourceEditingElementWrapper.querySelector('textarea');
+
+                    // TODO(fspreck) this has to be more intelligent since it
+                    // leads to an infinite update loop...
+                    textarea.addEventListener("input", (e) => {
+                        console.log("Input in source mode");
+                        // sourceEditingPlugin._updateEditorData();
+                    });
+                }
+            });
         } catch (error) {
             logger.error(error.stack);
         }