fix(click): explicitly fail when element detached during click (#1835)

We used to timeout instead.

src/injected/injected.ts

@@ -286,12 +286,16 @@ class Injected {
       // and only force layout during actual rafs as a small optimisation.
       if (++counter === 1)
         return false;
+      if (!node.isConnected)
+        return 'Element is not attached to the DOM';
       const clientRect = element.getBoundingClientRect();
       const rect = { x: clientRect.top, y: clientRect.left, width: clientRect.width, height: clientRect.height };
       const isDisplayedAndStable = lastRect && rect.x === lastRect.x && rect.y === lastRect.y && rect.width === lastRect.width && rect.height === lastRect.height && rect.width > 0 && rect.height > 0;
       lastRect = rect;
       return isDisplayedAndStable;
     });
+    if (typeof result === 'string')
+      throw new Error(result);
     if (!result)
       throw new Error(`waiting for element to be displayed and not moving failed: timeout exceeded`);
   }
@@ -303,11 +307,15 @@ class Injected {
     if (!element)
       throw new Error('Element is not attached to the DOM');
     const result = await this.poll('raf', timeout, () => {
+      if (!element!.isConnected)
+        return 'Element is not attached to the DOM';
       let hitElement = this._deepElementFromPoint(document, point.x, point.y);
       while (hitElement && hitElement !== element)
         hitElement = this._parentElementOrShadowHost(hitElement);
       return hitElement === element;
     });
+    if (typeof result === 'string')
+      throw new Error(result);
     if (!result)
       throw new Error(`waiting for element to receive mouse events failed: timeout exceeded`);
   }

test/click.spec.js

@@ -554,6 +554,25 @@ describe('Page.click', function() {
     if (error2)
       expect(error2.message).toContain('timeout exceeded');
   });
+  it('should fail when element detaches after animation', async({page, server}) => {
+    await page.setContent(`<style>body, html { margin: 0; padding: 0; }</style><button onclick="window.clicked=true">Click me</button>`);
+    await page.$eval('button', button => {
+      button.style.transition = 'margin-left 100000ms linear';
+    });
+    await page.$eval('button', button => {
+      button.style.marginLeft = '100000px';
+    });
+    const handle = await page.$('button');
+    const promise = handle.click().catch(e => e);
+    await page.$eval('button', button => {
+      button.style.marginLeft = button.getBoundingClientRect().left + 'px';
+      button.style.transition = '';
+      button.remove();
+    });
+    const error = await promise;
+    expect(await page.evaluate(() => window.clicked)).toBe(undefined);
+    expect(error.message).toContain('Element is not attached to the DOM');
+  });
 });
 
 describe('Page.check', function() {