Client: Implement xdg-decoration-unstable-v1 for SSD support

[ChangeLog][QPA plugin] Added client-side support for the
xdg-decoration-unstable-v1 Wayland extension. Qt clients will now let the
compositor draw the window decorations if configured through this extension.

Note: The env var QT_WAYLAND_DISABLE_WINDOWDECORATION is still supported, but
works on a higher level, and for all shell integrations, while xdg-decoration
only works with xdg-shell stable.

Task-number: QTBUG-69746
Change-Id: I9dd0331bbd8d624c6be54ed23ee3b96446d5820d
Reviewed-by: Pier Luigi Fiorini <pierluigi.fiorini@liri.io>

1 files changed, 7 insertions, 0 deletions

diff --git a/src/client/qwaylanddisplay.cpp b/src/client/qwaylanddisplay.cpp
index 40ceafd96..5e67cd3a6 100644
--- a/src/client/qwaylanddisplay.cpp
+++ b/src/client/qwaylanddisplay.cpp
@@ -326,6 +326,13 @@ void QWaylandDisplay::addRegistryListener(RegistryListener listener, void *data)
         (*l.listener)(l.data, mGlobals[i].registry, mGlobals[i].id, mGlobals[i].interface, mGlobals[i].version);
 }
 
+void QWaylandDisplay::removeListener(RegistryListener listener, void *data)
+{
+    std::remove_if(mRegistryListeners.begin(), mRegistryListeners.end(), [=](Listener l){
+        return (l.listener == listener && l.data == data);
+    });
+}
+
 uint32_t QWaylandDisplay::currentTimeMillisec()
 {
     //### we throw away the time information