Resize preference save sequence

.changeset/fair-laws-serve.md

@@ -0,0 +1,6 @@
+---
+"ember-headless-table": patch
+---
+
+Fixes column resize and preference save sequencing
+to ensure that the functions always run in the correct order.

ember-headless-table/src/plugins/column-resizing/handle.ts

@@ -111,24 +111,41 @@ class ResizeHandle extends Modifier<{ Args: { Positional: [Column] } }> {
     }
   };
 
-  queueUpdate = () => {
-    cancelAnimationFrame(this.dragFrame);
+  /**
+   * queueUpdate takes an optional function argument that is called
+   * in the requestAnimationFrame callback _after_ the resize function.
+   *
+   * We can use this to ensure that preferences are only ever saved after
+   * we have completed column resizing.
+   *
+   * Because the requestAnimationFrame 'hides' these function calls from the
+   * the ember test waiter, we also ensure that we track them by also cancelling
+   * the waiter in the requestAnimationFrame callback.
+   */
+  queueUpdate = (callback?: () => void) => {
+    if (this.dragFrame) {
+      cancelAnimationFrame(this.dragFrame);
+    }
+
     this.dragFrame = requestAnimationFrame(() => {
       this.meta.resize(this.pointerX - this.pointerStartX);
       this.pointerStartX = this.pointerX;
+
+      if (callback) {
+        callback();
+      }
+
+      if (this.token) {
+        waiter.endAsync(this.token);
+        this.token = undefined;
+      }
     });
   };
 
   dragEndHandler = () => {
     this.meta.isResizing = false;
-    this.queueUpdate();
-
-    if (this.token) {
-      waiter.endAsync(this.token);
-      this.token = undefined;
-    }
 
-    this.meta.save();
+    this.queueUpdate(this.meta.save);
 
     /**
      * No need to listen if we aren't dragging

ember-headless-table/src/test-support/index.ts

@@ -28,18 +28,9 @@ export function createHelpers(selectors: Selectors) {
 
     triggerEvent(element, 'mousedown', { clientX: startX, button: 0 });
     triggerEvent(element, 'mousemove', { clientX: targetX, button: 0 });
-
-    await new Promise((resolve) => setTimeout(resolve, 50));
-
     triggerEvent(element, 'mouseup', { clientX: targetX, button: 0 });
 
     await settled();
-
-    /**
-     * This has been super finnicky... :(
-     */
-    await new Promise((resolve) => setTimeout(resolve, 100));
-    await requestAnimationFrameSettled();
   }
 
   function horizontalScrollElement() {

test-app/tests/plugins/column-resizing/rendering-test.gts

@@ -297,9 +297,7 @@ module('Plugins | resizing', function (hooks) {
       }, 'All column preferences reset');
     });
 
-    test('it resizes each column', async function (assert) {
-      // Columns are set to equal widths so each of the four columns
-      // will initially be 250px wide in the 1000px wide container
+    test('it resizes each column and persists the new widths in the preferences', async function (assert) {
       ctx.setContainerWidth(1000);
       await render(
         <template>
@@ -314,30 +312,35 @@ module('Plugins | resizing', function (hooks) {
       debugAssert(`columnC doesn't exist`, columnC);
       debugAssert(`columnD doesn't exist`, columnD);
 
+      assert.equal(width(columnA), 300, 'col A has expected width before resize');
+      assert.equal(width(columnB), 250, 'col B has expected width before resize');
+      assert.equal(width(columnC), 250, 'col C has expected width before resize');
+      assert.equal(width(columnD), 200, 'col D has expected width before resize');
+
       await requestAnimationFrameSettled();
 
-      await assertChanges(
-        () => dragRight(columnB, 50),
-        [
-          { value: () => width(columnA), by: 50, msg: 'width of A increased by 50' },
-          { value: () => width(columnB), by: -50, msg: 'width of B decreased by 50' },
-          { value: () => width(columnC), by: 0, msg: 'width of C unchanged' },
-          { value: () => width(columnD), by: 0, msg: 'width of D unchanged' },
-        ]
-      );
+      // move the the resize handler between columns A & B 200px to the right
+      // increasing the width of column A and decreasing the width of columns
+      // to the right , while respecting the min width (128px)
+      await dragRight(columnB, 200);
+
+      assert.equal(width(columnA), 500, 'col A has expected width after resize');
+      assert.equal(width(columnB), 128, 'col B has expected width after resize');
+      assert.equal(width(columnC), 172, 'col C has expected width after resize');
+      assert.equal(width(columnD), 200, 'col D has expected width after resize');
 
       assert.deepEqual(preferences, {
         "plugins": {
           "ColumnResizing": {
             "columns": {
               "A": {
-                "width": "350"
+                "width": "500"
               },
               "B": {
-                "width": "200"
+                "width": "128"
               },
               "C": {
-                "width": "250"
+                "width": "172"
               },
               "D": {
                 "width": "200"