add event id to html element

lib/Timeline.js

@@ -615,6 +615,7 @@ let Timeline = class Timeline extends lit_element_1.LitElement {
       start="${evt.start.getHours()}"
       end="${evt.end.getHours()}"
       style="${style_map_1.styleMap(style)}"
+      evenId="${evt.id}"
       @mousedown="${this._getEventGrabHandler(evt, resizer, editableRessource, this._getEventClickHandler(evt))}"
       @click="${(e) => e.stopPropagation()}"
     >

src/Timeline.ts

@@ -738,6 +738,7 @@ class Timeline extends LitElement {
       start="${evt.start.getHours()}"
       end="${evt.end.getHours()}"
       style="${styleMap(style)}"
+      evenId="${evt.id}"
       @mousedown="${this._getEventGrabHandler(
         evt,
         resizer,