preventDefault on mouse event such that the editor stays focused, fixes #12246

src/vs/editor/contrib/quickFix/browser/lightBulbWidget.ts

@@ -44,8 +44,8 @@ export class LightBulbWidget implements IContentWidget, IDisposable {
 			this.domNode.style.width = '20px';
 			this.domNode.style.height = '20px';
 			this.domNode.className = 'lightbulb-glyph';
-			this.toDispose.push(dom.addDisposableListener(this.domNode, 'mousedown', (e) => {
-				this.editor.focus();
+			this.toDispose.push(dom.addDisposableListener(this.domNode, 'mousedown', (e:MouseEvent) => {
+				e.preventDefault();
 				this.onclick(this.position);
 			}));
 		}