Fix #85152, use padding instead of margins for twisties

FYI @joaomoreno

src/vs/base/browser/ui/tree/abstractTree.ts

@@ -336,7 +336,7 @@ class TreeRenderer<T, TFilterData, TRef, TTemplateData> implements IListRenderer
 		}
 
 		const indent = TreeRenderer.DefaultIndent + (node.depth - 1) * this.indent;
-		templateData.twistie.style.marginLeft = `${indent}px`;
+		templateData.twistie.style.paddingLeft = `${indent}px`;
 		templateData.indent.style.width = `${indent + this.indent - 16}px`;
 
 		this.renderTwistie(node, templateData);

src/vs/base/browser/ui/tree/media/tree.css

@@ -41,7 +41,7 @@
 .monaco-tl-twistie {
 	font-size: 10px;
 	text-align: right;
-	margin-right: 6px;
+	padding-right: 6px;
 	flex-shrink: 0;
 	width: 16px;
 	display: flex !important;