rename suggestions: fix: set border-radius on rename suggestions to give more polished look

fixes microsoft/vscode-copilot#5306

Author: ulugbekna

src/vs/editor/contrib/rename/browser/renameWidget.css

@@ -42,6 +42,10 @@
 	background-color: var(--vscode-toolbar-hoverBackground)
 }
 
+.monaco-editor .rename-box .rename-candidate-list-container .monaco-list-row {
+	border-radius: 2px;
+}
+
 .monaco-editor .rename-box .rename-label {
 	display: none;
 	opacity: .8;

src/vs/editor/contrib/rename/browser/renameWidget.ts

@@ -667,6 +667,7 @@ class RenameCandidateListView {
 		this._typicalHalfwidthCharacterWidth = opts.fontInfo.typicalHalfwidthCharacterWidth;
 
 		this._listContainer = document.createElement('div');
+		this._listContainer.className = 'rename-box rename-candidate-list-container';
 		parent.appendChild(this._listContainer);
 
 		this._listWidget = RenameCandidateListView._createListWidget(this._listContainer, this._candidateViewHeight, opts.fontInfo);
@@ -992,6 +993,7 @@ class RenameCandidateView {
 	constructor(parent: HTMLElement, fontInfo: FontInfo) {
 
 		this._domNode = document.createElement('div');
+		this._domNode.className = 'rename-box rename-candidate';
 		this._domNode.style.display = `flex`;
 		this._domNode.style.columnGap = `5px`;
 		this._domNode.style.alignItems = `center`;