[Webkit-unassigned] [Bug 259858] New: [Gtk4] Blank webview with 2.41.6 in NewsFlash

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=259858

            Bug ID: 259858
           Summary: [Gtk4] Blank webview with 2.41.6 in NewsFlash
           Product: WebKit
           Version: Other
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Major
          Priority: P2
         Component: WebKitGTK
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: EvilTwin1 at gmx.de
                CC: bugs-noreply at webkitgtk.org

Created attachment 467205

  --> https://bugs.webkit.org/attachment.cgi?id=467205&action=review

epiphany & newsflash webkit://gpu output (both are identical)

The flatpak builds of NewsFlash with org.gnome.Sdk//master show a blank webview on my system with AMD GPU. Local builds work as expected.
I'm on fedora 38 which ships webkitgtk6.0 2.40.5 while the gnome master sdk ships 2.41.6.

The symptoms are pretty similar to #228268 in that the content of the webview is completely white (even in dark mode) but text and images are visible during a drag action. The inspector UI is completely unaffected by the bug.

The devel flatpak of epiphany which makes use of the exact same gnome sdk with the exact same webkit binary works as expected.

The culprit for NewsFlash on webkitgtk6.0 2.41.6 seems to be the hardware acceleration policy. If I force it to software rendering with "Never" content appears as expected.
That makes me wonder why epiphany works because "/org/gnome/epiphany/web/hardware-acceleration-policy" is set to "always". Or is the flaptak making use of its own sandboxed version of the gsettings database?

A CI build of NewsFlash that hits the bug on my pc can be found here: https://gitlab.com/news_flash/news_flash_gtk/-/jobs/4810676070/artifacts/raw/io.gitlab.news_flash.NewsFlash.Devel-3.0.0-e3738cd5.flatpak

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