[Webkit-unassigned] [Bug 199570] New: Blank web view when transitioning between hardware acceleration (composition) modes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=199570

            Bug ID: 199570
           Summary: Blank web view when transitioning between hardware
                    acceleration (composition) modes
           Product: WebKit
           Version: WebKit Local Build
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKitGTK
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mail at ambrevar.xyz
                CC: bugs-noreply at webkitgtk.org

WebKitGTK 2.24.2

I'm working on the WebKitGTK port of Next browser:
https://next.atlas.engineer.
(Mirror: https://github.com/atlas-engineer/next)

When I switch "buffer" (or "tab") between 1 page displaying https://imdb.com and
another displaying https://github.com, the github page is _very often_
blank (not always).  If I open a new tab for github, it works.

After a discussion with Michael Catanzaro, we presumed that the issue may lie in
the transition in and out of accelerated composition mode.

Indeed, if I start Next with WEBKIT_FORCE_COMPOSITING_MODE=1, the issue
disappears.

A work around would be to set it to "forced" with
webkit_settings_set_hardware_acceleration_policy(), but what about systems that
do not support hardware acceleration then?

The problem occurs on master (for posterity: commit e13f5b9ecd232aa780b636a0c873fdccc1be6f0d).

Could be related to
https://bugs.webkit.org/show_bug.cgi?id=193224.

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