fix #56715

src/vs/workbench/browser/parts/editor/noTabsTitleControl.ts

@@ -88,6 +88,8 @@ export class NoTabsTitleControl extends TitleControl {
 
 		// Close editor on middle mouse click
 		if (e instanceof MouseEvent && e.button === 1 /* Middle Button */) {
+			EventHelper.stop(e, true /* for https://github.com/Microsoft/vscode/issues/56715 */);
+
 			this.group.closeEditor(this.group.activeEditor);
 		}
 	}

src/vs/workbench/browser/parts/editor/tabsTitleControl.ts

@@ -490,6 +490,8 @@ export class TabsTitleControl extends TitleControl {
 			tab.blur();
 
 			if (e.button === 1 /* Middle Button*/ && !this.originatesFromTabActionBar(e)) {
+				e.stopPropagation(); // for https://github.com/Microsoft/vscode/issues/56715
+
 				this.blockRevealActiveTabOnce();
 				this.closeOneEditorAction.run({ groupId: this.group.id, editorIndex: index });
 			}