[Webkit-unassigned] [Bug 257368] New: [GTK] WebView content keeps disappearing on Rawhide (Evolution 3.48.1, webkit 2.41.3)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=257368

            Bug ID: 257368
           Summary: [GTK] WebView content keeps disappearing on Rawhide
                    (Evolution 3.48.1, webkit 2.41.3)
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKitGTK
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mcrha at redhat.com
                CC: bugs-noreply at webkitgtk.org

This is reported downstream at:
https://bugzilla.redhat.com/show_bug.cgi?id=2192408
More info can be found there.

On current Fedora Rawhide, with evolution-3.48.1-1.fc39.x86_64 and webkit2gtk4.1-2.41.3-1.fc39.x86_64 , the content of the preview pane often suddenly disappears. It still reacts as if it's there - if you blindly click on a link it will open - but you can't see it. Clicking anywhere in the preview pane after this happens brings it back, so it's not fatal, just annoying.

Steps to reproduce reliably, which worked at least for me, within Evolution:
a) select a different message to be viewed - it's shown in the preview panel below the message list
b) right-click the selected folder in the folder tree on the left and pick Properties
c) click three times on a checkbox "Copy for offline use" (I have the folder set to do the copy)
d) click the Close button - the mouse cursor is now roughly in the middle of the preview panel,
   which still shows the message content
e) move mouse cursor away from the web view - I usually move it to the top,
   but to the left worked as well

As soon as the mouse moves away from the web view the web view turns into grey. The items inside are still there, I can move the cursor abot the scrollbar and it suddenly appears. If the page has any buttons (like when there's an attachent), the buttons are shown too after moveing above them. This does not apply to the links. When I click to the message body, like if I'd like to focus the web view, the whole page redraws and everything is fine again.

All the steps are needed here, skipping any of them does not reproduce the problem. Even the a), selecting a new message to be viewed, is required.

It happens also when I run Evolution as:

   WEBKIT_DISABLE_DMABUF_RENDERER=1 evolution

I run the rawhide in a virtual machine. There is this printed after the evolution start:

   libEGL warning: pci id for fd 16: 1b36:0100, driver (null)

I do not know whether it's related. I saw different libEGL notices in the virtual machines, but none have any visible impact. This warning is shown shortly after start, before the bug exhibits.

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