elyra-ai#2122 Expression builder - After expression validation, chars…

… need to be entered twice to reflect (elyra-ai#2123)

canvas_modules/common-canvas/src/common-properties/controls/expression/expression.jsx

@@ -102,8 +102,16 @@ class ExpressionControl extends React.Component {
 			});
 			this.editor.focus();
 		}
-		if (!isEqual(this.getCodemirrorState()?.doc.toString(), this.props.value)) {
-			this.editor.dispatch({ changes: { from: 0, to: this.getCodemirrorState()?.doc?.length, insert: this.props.value } });
+		if (!isEqual(prevProps.value, this.props.value)) {
+			const selection = this.editor.state.selection.main;
+			this.editor.dispatch({
+				changes: {
+					from: 0,
+					to: this.getCodemirrorState()?.doc?.length,
+					insert: this.props.value },
+				selection: {
+					anchor: selection.anchor,
+					head: selection.head } });
 		}
 	}