feat: Add coalesced flag to mouse and touch move events

src/handlers.js

@@ -234,19 +234,22 @@ class Handlers {
 
   // `pointermove` and `mousemove` event handler
   handlePointerMove(event) {
+    let events = [];
     if (this._captureCoalescedEvents && event.getCoalescedEvents) {
-      event.getCoalescedEvents().forEach((coalescedEvent) => {
-        this.handleSinglePointerMove(coalescedEvent);
-      });
-    } else {
-      this.handleSinglePointerMove(event);
+      events = event.getCoalescedEvents();
+    }
+    if (events.length === 0) {
+      events = [event];
     }
+    events.forEach((coalescedEvent, index) => {
+      this.handleSinglePointerMove(coalescedEvent, index !== events.length - 1);
+    });
   }
 
-  handleSinglePointerMove(event) {
+  handleSinglePointerMove(event, coalesced) {
     switch (event.pointerType) {
       case 'mouse':
-        this.handleMouseMove(event);
+        this.handleMouseMove(event, coalesced);
         break;
       case 'touch':
         this.push(
@@ -255,6 +258,7 @@ class Handlers {
           event.pointerId,
           event.screenX,
           event.screenY,
+          coalesced ? 1 : 0,
         );
         break;
       default:
@@ -303,13 +307,14 @@ class Handlers {
   }
 
   // `mousemove` event handler
-  handleMouseMove(event) {
+  handleMouseMove(event, coalesced) {
     this.push(
       MOUSE_MOVE_MESSAGE_TYPE,
       TimeUtils.convertEventTimeToTs(event.timeStamp),
       event.screenX,
       event.screenY,
       event.buttons,
+      coalesced ? 1 : 0,
     );
   }
 
@@ -359,6 +364,7 @@ class Handlers {
         touch.identifier,
         touch.screenX,
         touch.screenY,
+        false,
       );
     });
   }

test/trap.pointer-events.test.js

@@ -177,6 +177,7 @@ describe('browser with pointer events', () => {
         1,
         2,
         0,
+        1,
       ]);
 
     expect(moveEvents[1])
@@ -186,6 +187,7 @@ describe('browser with pointer events', () => {
         3,
         4,
         0,
+        0,
       ]);
   });
 
@@ -217,6 +219,7 @@ describe('browser with pointer events', () => {
         3,
         4,
         0,
+        0,
       ]);
   });