Use CKEditor 5 for description editing.

assets/ckeditor/plugins/singleLine.js

@@ -0,0 +1,29 @@
+import Plugin from '@ckeditor/ckeditor5-core/src/plugin';
+
+export default class SingleLinePlugin extends Plugin {
+    init() {
+        const editor = this.editor;
+        const view = editor.editing.view;
+        const viewDocument = view.document;
+
+        //Listen to enter presses
+        this.listenTo( viewDocument, 'enter', ( evt, data ) => {
+            //If user presses enter, prevent the enter action
+            evt.stop();
+        }, { priority: 'high' } );
+
+        //And clipboard pastes
+        this.listenTo( viewDocument, 'clipboardInput', ( evt, data ) => {
+            let dataTransfer = data.dataTransfer;
+
+            //Clean text input (replace newlines with spaces)
+            let input = dataTransfer.getData("text");
+            let cleaned = input.replace(/\r?\n/g, ' ');
+
+            //We can not use the dataTransfer.setData method because the old object is somehow protected
+            data.dataTransfer = new DataTransfer();
+            data.dataTransfer.setData("text", cleaned);
+            
+        }, { priority: 'high' } );
+    }
+}