Version 1.2.0 isn't compatible with the coming GNOME 3.32, due to version checks. The master branch contains the needed version bump, so backport it. Here is the corresponding pull request: https://src.fedoraproject.org/rpms/xdg-desktop-portal-gtk/pull-request/2
Proposing as a Fedora 30 freeze exception to get working screencast.
xdg-desktop-portal-gtk-1.2.0-3.fc30 has been submitted as an update to Fedora 30. https://bodhi.fedoraproject.org/updates/FEDORA-2019-4dcbe4b23c
xdg-desktop-portal-gtk-1.2.0-3.fc30 has been pushed to the Fedora 30 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2019-4dcbe4b23c
Discussed during the 2019-03-11 blocker review meeting: [1] The decision to classify this bug as an "AcceptedFreezeException" was made as this doesn't seem like a deal-breaking feature, but the risk seems equally low and the issue can't be fixed for live images with an update, so accepted as an FE. [1] https://meetbot.fedoraproject.org/fedora-blocker-review/2019-03-11/f30-blocker-review.2019-03-11-16.04.txt
xdg-desktop-portal-gtk-1.2.0-3.fc30 has been pushed to the Fedora 30 stable repository. If problems still persist, please make note of it in this bug report.