fix(core): preserve event query context. close #21584

src/core/echarts.ts

@@ -1357,14 +1357,22 @@ class ECharts extends Eventful<ECEventDefinition> {
                     params.event = e;
                     params.type = eveName;
 
-                    (this._$eventProcessor as ECEventProcessor).eventInfo = {
+                    const eventProcessor = this._$eventProcessor as ECEventProcessor;
+                    // A user handler may synchronously trigger another ECharts event.
+                    const previousEventInfo = eventProcessor.eventInfo;
+                    eventProcessor.eventInfo = {
                         targetEl: el,
                         packedEvent: params,
                         model: model,
                         view: view
                     };
 
-                    this.trigger(eveName, params);
+                    try {
+                        this.trigger(eveName, params);
+                    }
+                    finally {
+                        eventProcessor.eventInfo = previousEventInfo;
+                    }
                 }
             };
             // Consider that some component (like tooltip, brush, ...)

src/util/ECEventProcessor.ts

@@ -144,8 +144,4 @@ export class ECEventProcessor implements EventProcessor {
         }
     }
 
-    afterTrigger() {
-        // Make sure the eventInfo won't be used in next trigger.
-        this.eventInfo = null;
-    }
 };