From 15be0b80c2783d5e639412ab3f46f5f241d8f140 Mon Sep 17 00:00:00 2001
From: Patrick Custer <pcuster@stsci.edu>
Date: Wed, 8 Oct 2025 11:12:08 -0400
Subject: [PATCH 1/2] jitter reduction

---
 js/models/event_handler.js | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/js/models/event_handler.js b/js/models/event_handler.js
index 1b5b880e..cea33e89 100644
--- a/js/models/event_handler.js
+++ b/js/models/event_handler.js
@@ -98,6 +98,12 @@ export default class EventHandler {
         return;
       }
       jsTargetLock.lock();
+
+      // ensure we only update the view once dragging is completed
+      if (this.aladin.view.dragging) {
+        return;
+      }
+
       const raDec = [position.ra, position.dec];
       this.updateWCS();
       // When dragging the view, north to east position angle might changes because
@@ -128,6 +134,13 @@ export default class EventHandler {
         return;
       }
       jsFovLock.lock();
+
+      // ensure we only update the view once zooming is compelte
+      const zoom = this.aladin.view.zoom;
+      if (zoom.isZooming && fov != zoom.finalZoom) {
+        return;
+      }
+
       // fov MUST be cast into float in order to be sent to the model
       this.updateWCS();
       this.update2AxisFoV();

From 55734ad5e89ff061b056fec6e32811082322a180 Mon Sep 17 00:00:00 2001
From: Patrick Custer <pcuster@stsci.edu>
Date: Wed, 8 Oct 2025 11:13:54 -0400
Subject: [PATCH 2/2] update comments

---
 js/models/event_handler.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/js/models/event_handler.js b/js/models/event_handler.js
index cea33e89..12c7aea6 100644
--- a/js/models/event_handler.js
+++ b/js/models/event_handler.js
@@ -99,7 +99,7 @@ export default class EventHandler {
       }
       jsTargetLock.lock();
 
-      // ensure we only update the view once dragging is completed
+      // only update `_target` once dragging is completed
       if (this.aladin.view.dragging) {
         return;
       }
@@ -135,7 +135,7 @@ export default class EventHandler {
       }
       jsFovLock.lock();
 
-      // ensure we only update the view once zooming is compelte
+      // only update `_fov` once zooming is compelte
       const zoom = this.aladin.view.zoom;
       if (zoom.isZooming && fov != zoom.finalZoom) {
         return;