Handle pointer capture loss during palette resize

CHANGELOG.md

@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Draw operations can no longer begin outside of the editor viewport.
 - Graceful handling for cases where pointer capture is lost while using a tool.
+- Graceful handling for cases where pointer capture is lost while resizing the palette.
 
 ### Fixed
 

src/core/components/palette.js

@@ -481,15 +481,20 @@ export class Palette extends PhaserInstance {
 
     let onPointerUp = (_event) => {
       gutter.releasePointerCapture(event.pointerId);
+    };
+
+    let onLostPointerCapture = (_event) => {
       this.gutterActive = false;
       this.width = this.calcWidth();
       this.dispatchEvent(new CustomEvent("resize-end"));
-      window.removeEventListener("pointermove", onPointerMove);
-      window.removeEventListener("pointerup", onPointerUp);
+      gutter.removeEventListener("pointermove", onPointerMove);
+      gutter.removeEventListener("pointerup", onPointerUp);
+      gutter.removeEventListener("lostpointercapture", onLostPointerCapture);
     };
 
-    window.addEventListener("pointermove", onPointerMove);
-    window.addEventListener("pointerup", onPointerUp);
+    gutter.addEventListener("pointermove", onPointerMove);
+    gutter.addEventListener("pointerup", onPointerUp);
+    gutter.addEventListener("lostpointercapture", onLostPointerCapture);
 
     this.dispatchEvent(new CustomEvent("resize-start"));
   }