[webkit-gtk] WebkitGtk 2.26.0 WebKitWebView fails to display in a Gtk3 app.

[Michael Catanzaro]

Hi, the default hardware acceleration policy changed from 
WEBKIT_HARDWARE_ACCELERATION_POLICY_ON_DEMAND to 
WEBKIT_HARDWARE_ACCELERATION_POLICY_ALWAYS. I think you need to add 
"--device=dri" to the finish-args in your flatpak-builder manifest:

https://github.com/flathub/org.gnucash.GnuCash/blob/master/org.gnucash.GnuCash.json

so try that. If that fixes it, let us know and I'll post an 
announcement to remind other maintainers.

Alternatively, you could use 
webkit_settings_set_hardware_acceleration_policy() to select 
WEBKIT_HARDWARE_ACCELERATION_POLICY_NEVER to disable GPU usage. This 
option will go away with GTK 4 though -- WebKitGTK will always require 
GPU -- so probably better to leave it enabled and shake out any 
problems now.

Hope that helps,

Michael