<html>
    <head>
      <base href="https://bugzilla.gnome.org/" />
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - gtk3 3.21.5 broke displaying drop-down lists"
   href="https://bugzilla.gnome.org/show_bug.cgi?id=771117">771117</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>gtk3 3.21.5 broke displaying drop-down lists
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Platform
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>gtk+
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>3.21.x
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>Normal
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>Backend: Wayland
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>gtk-bugs@gtk.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>kparal@redhat.com
          </td>
        </tr>

        <tr>
          <th>QA Contact</th>
          <td>gtk-bugs@gtk.org
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>rob@robster.org.uk, wayland-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>GNOME version</th>
          <td>---
          </td>
        </tr></table>
      <p>
        <div>
        <pre>With gtk3-3.21.4-2.fc25.x86_64, everything worked fine. With
gtk3-3.21.5-1.fc25.x86_64, all drop-down lists available in
gnome-control-center (e.g. in Power) are broken - if you click on them, they
display only an empty list, and the real values are hidden outside of the
visible area - you need to scroll to display them. Some of them can't be used
at all (the drop-down list under Suspend & Power button - other values can't be
displayed even with scrolling).

See the video to showcase the problem.

This happens on Wayland, but does not happen when I run gnome-control-center
with GDK_BACKEND=x11 GTK_CSD=1, and did not happen in previous gtk version
(tested with downgrade).

control-center-3.20.1-1.fc25.x86_64
gdk-pixbuf2-2.35.4-1.fc25.x86_64
gdk-pixbuf2-modules-2.35.4-1.fc25.x86_64
gnome-session-wayland-session-3.21.90-1.fc25.x86_64
gnome-shell-3.21.91-1.fc25.x86_64
gtk3-3.21.5-1.fc25.x86_64
libwayland-client-1.11.92-1.fc25.x86_64
libwayland-cursor-1.11.92-1.fc25.x86_64
libwayland-server-1.11.92-1.fc25.x86_64
mesa-libwayland-egl-12.0.2-1.fc25.x86_64
mutter-3.21.91-2.fc25.x86_64
xorg-x11-server-Xwayland-1.18.4-5.fc25.x86_64
Fedora 25</pre>
        </div>
      </p>
      <hr>
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      <ul>
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