[Webkit-unassigned] [Bug 195341] New: [ iOS Simulator ] REGRESSION (r237087) Layout Test fast/viewport/ios/*-width-viewport-after-changing-view-scale.html is a flaky failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=195341

            Bug ID: 195341
           Summary: [ iOS Simulator ] REGRESSION (r237087) Layout Test
                    fast/viewport/ios/*-width-viewport-after-changing-view
                    -scale.html is a flaky failure
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sroberts at apple.com
                CC: lforschler at apple.com

The following layout tests are flaky on iOS Simulator

fast/viewport/ios/constant-width-viewport-after-changing-view-scale.html
fast/viewport/ios/device-width-viewport-after-changing-view-scale.html

Probable cause:

Test has been a flaky failure since it was created in r237087

Around revision 240714 I had to add --child-processes 4 to get it to fail, but it produced the same diffs

Reproduced with :

run-webkit-tests fast/viewport/ios/constant-width-viewport-after-changing-view-scale.html fast/viewport/ios/device-width-viewport-after-changing-view-scale.html --iterations 50 -f --ios-simulator --child-processes 4

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=%20fast%2Fviewport%2Fios%2Fconstant-width-viewport-after-changing-view-scale.html%20fast%2Fviewport%2Fios%2Fdevice-width-viewport-after-changing-view-scale.html

Diffs

--- /Volumes/Data/slave/ios-simulator-12-release-tests-wk2/build/layout-test-results/fast/viewport/ios/constant-width-viewport-after-changing-view-scale-expected.txt
+++ /Volumes/Data/slave/ios-simulator-12-release-tests-wk2/build/layout-test-results/fast/viewport/ios/constant-width-viewport-after-changing-view-scale-actual.txt
@@ -1,7 +1,7 @@
 setViewScale(0.50)
-window size: [1280, 2192]
+window size: [640, 1096]
 square size: [128, 219]
-zoom scale: 0.25
+zoom scale: 0.50

 setViewScale(0.75)
 window size: [853, 1461]

--- /Volumes/Data/slave/ios-simulator-12-release-tests-wk2/build/layout-test-results/fast/viewport/ios/device-width-viewport-after-changing-view-scale-expected.txt
+++ /Volumes/Data/slave/ios-simulator-12-release-tests-wk2/build/layout-test-results/fast/viewport/ios/device-width-viewport-after-changing-view-scale-actual.txt
@@ -29,9 +29,9 @@
 zoom scale: 1.25

 setViewScale(1.00)
-window size: [320, 548]
+window size: [256, 438]
 square size: [32, 55]
-zoom scale: 1.00
+zoom scale: 1.25

 setViewScale(0.75)
 window size: [427, 731]

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