Suggested Edit - add new line if there is already comment

Release-Notes: skip
Google-Bug-Id: b/296218939
Change-Id: I91024f6e3acc1ffceb097ab1d68770e5f024ef25
diff --git a/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.ts b/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.ts
index d27be9f..e2229b5 100644
--- a/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.ts
+++ b/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.ts
@@ -1187,7 +1187,10 @@
   async createSuggestEdit(e: MouseEvent) {
     e.stopPropagation();
     const line = await this.getCommentedCode();
-    this.messageText += `${USER_SUGGESTION_START_PATTERN}${line}${'\n```'}`;
+    const addNewLine = this.messageText.length !== 0;
+    this.messageText += `${
+      addNewLine ? '\n' : ''
+    }${USER_SUGGESTION_START_PATTERN}${line}${'\n```'}`;
   }
 
   async getCommentedCode() {