Bug 208216

Summary:	REGRESSION: (r257268) [ iPadOS wk2 ] fast/scrolling/ios/change-scrollability-on-content-resize-nested.html is failing.
Product:	WebKit	Reporter:	Jason Lawrence <Lawrence.j>
Component:	Scrolling	Assignee:	Nobody <webkit-unassigned>
Status:	RESOLVED FIXED
Severity:	Normal	CC:	simon.fraser, webkit-bot-watchers-bugzilla, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

Description Jason Lawrence 2020-02-25 13:45:24 PST

fast/scrolling/ios/change-scrollability-on-content-resize-nested.html

Description:
This test is failing on iOS simulator for iPad wk2. It appears to have a regression point of r257268, but it's a newer test and I haven't attempted to reproduce the issue yet.

History:
https://results.webkit.org/?suite=layout-tests&test=fast%2Fscrolling%2Fios%2Fchange-scrollability-on-content-resize-nested.html&flavor=wk2&limit=50000&platform=ios

Diff:
--- /Volumes/Data/slave/ipados-simulator-13-debug-tests-wk2/build/layout-test-results/fast/scrolling/ios/change-scrollability-on-content-resize-nested-expected.txt
+++ /Volumes/Data/slave/ipados-simulator-13-debug-tests-wk2/build/layout-test-results/fast/scrolling/ios/change-scrollability-on-content-resize-nested-actual.txt
@@ -75,7 +75,6 @@
 (Frame scrolling node
   (scrollable area size 800 600)
   (contents size 800 600)
-  (parent relative scrollable rect at (0,0) size 800x600)
   (scrollable area parameters 
     (horizontal scroll elasticity 1)
     (vertical scroll elasticity 1)
@@ -89,7 +88,6 @@
     (Overflow scrolling node
       (scrollable area size 300 200)
       (contents size 300 400)
-      (parent relative scrollable rect at (8,13) size 300x200)
       (scrollable area parameters 
         (horizontal scroll elasticity 1)
         (vertical scroll elasticity 1)

Comment 1 Radar WebKit Bug Importer 2020-02-25 13:45:51 PST

<rdar://problem/59778492>

Comment 2 Jason Lawrence 2020-02-25 14:00:41 PST

I have marked this test as failing while this issue is investigated.
https://trac.webkit.org/changeset/257374/webkit

Comment 3 Jason Lawrence 2020-02-25 14:11:06 PST

I am able to reproduce the failures with r257268 (debug) by running the command below, but I cannot reproduce the issue with r257265.

Run-webkit-tests --no-retry --force --iterations 1000 fast/scrolling/ios/change-scrollability-on-content-resize-nested.html --debug --exit-after-n-failures 5 --pad-simulator

[1/1000] fast/scrolling/ios/change-scrollability-on-content-resize-nested.html failed unexpectedly (text diff)
[2/1000] fast/scrolling/ios/change-scrollability-on-content-resize-nested.html failed unexpectedly (text diff)
[3/1000] fast/scrolling/ios/change-scrollability-on-content-resize-nested.html failed unexpectedly (text diff)
[4/1000] fast/scrolling/ios/change-scrollability-on-content-resize-nested.html failed unexpectedly (text diff)
[5/1000] fast/scrolling/ios/change-scrollability-on-content-resize-nested.html failed unexpectedly (text diff)
Exiting early after 5 failures. 5 tests run.
0 tests ran as expected, 5 didn't (995 didn't run):


r257265:
All 1000 tests ran as expected.

Comment 4 Jason Lawrence 2020-02-25 14:28:33 PST

Rebaselined the test for iPad and removed the failing expectation.
https://trac.webkit.org/changeset/257376/webkit

Comment 5 Simon Fraser (smfr) 2020-02-25 14:48:28 PST

Rebaseline is fine.