[Webkit-unassigned] [Bug 238796] New: REGRESSION iOS 15.4: Leaflet map controls get hidden

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=238796

            Bug ID: 238796
           Summary: REGRESSION iOS 15.4: Leaflet map controls get hidden
           Product: WebKit
           Version: Safari 15
          Hardware: iPhone / iPad
                OS: iOS 15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: webkit at gis.ee
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 456684

  --> https://bugs.webkit.org/attachment.cgi?id=456684&action=review

video of panning around & hidden controls

Leaflet (https://github.com/Leaflet/Leaflet) is popular javascript map library.

iOS 15.4 created issue where map controls get hidden under tile layer.

How to reproduce:
* Visit leaflet map app: Example: https://gis.ee/meri/
* Zoom & pan around in map for a while
* See controls hidden under tile layer

Video:
https://i.imgur.com/Uu6H8pR.mp4
Image:
https://user-images.githubusercontent.com/7014925/161598316-48a6a455-fcf8-47c5-97da-cce9be4d374b.png


Github issues:
https://github.com/Leaflet/Leaflet/issues/8068
https://github.com/PaulLeCam/react-leaflet/issues/968
https://stackoverflow.com/questions/71614862/leaflet-control-disapperars-while-dragging-map-on-mobilereact


This problem does not appear in previous iOS versions or any other Android or Desktop browsers.

There are some reports that problem is also present in desktop Safari, but I don't have accesss desktop safari 15.4 to test it.

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