commit 83db5891addec70bea19f8e5d4387d8aef77b29b
Author: Dhruv Srivastava <dhruvsri@google.com>
Date:   Mon Oct 5 14:49:38 2020 +0200

    Allow events to pass detail when using dispatchEventThroughTarget
    
    Change-Id: I690b9b3fd645939afa135bdc7cca0adb4f37b6ea

diff --git a/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard-behavior.ts b/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard-behavior.ts
index a3233be..90dac88 100644
--- a/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard-behavior.ts
+++ b/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard-behavior.ts
@@ -193,10 +193,12 @@ export const hovercardBehaviorMixin = dedupingMixin(
        * Hovercard elements are created outside of <gr-app>, so if you want to fire
        * events, then you probably want to do that through the target element.
        */
-      dispatchEventThroughTarget(eventName: string) {
+      dispatchEventThroughTarget(eventName: string, detail?: unknown) {
+        if (!detail) detail = {};
         if (this._target)
           this._target.dispatchEvent(
             new CustomEvent(eventName, {
+              detail,
               bubbles: true,
               composed: true,
             })
@@ -463,7 +465,7 @@ export interface GrHovercardBehaviorInterface {
   removeListeners(): void;
   debounceHide(): void;
   cancelHideDebouncer(): void;
-  dispatchEventThroughTarget(eventName: string): void;
+  dispatchEventThroughTarget(eventName: string, detail?: unknown): void;
   hide(e?: MouseEvent): void;
   debounceShow(): void;
   debounceShowBy(delayMs: number): void;