WIP: make shift+enter work in lists

packages/editor/src/components/rich-text/index.js

@@ -567,7 +567,24 @@ export class RichText extends Component {
 			}
 
 			if ( this.multilineTag ) {
-				if ( this.onSplit && isEmptyLine( record ) ) {
+				if ( event.shiftKey ) {
+					const text = getTextContent( record );
+					const end = getSelectionEnd( record );
+					const length = text.length;
+					let toInsert = '\n';
+
+					// If the caret is at the end of the text, and there is no
+					// trailing line break or no text at all, we have to insert two
+					// line breaks in order to create a new line visually and place
+					// the caret there.
+					if ( ( end === length || charAt( record, end ) === LINE_SEPARATOR ) && (
+						text.charAt( end - 1 ) !== '\n' || length === 0
+					) ) {
+						toInsert = '\n\n';
+					}
+
+					this.onChange( insert( record, toInsert ) );
+				} else if ( this.onSplit && isEmptyLine( record ) ) {
 					this.onSplit( ...split( record ).map( this.valueToFormat ) );
 				} else {
 					this.onChange( insertLineSeparator( record ) );