Qt: interface menus bogus behaviour

simplescreenrecorder-2022-08-01_10.30.44.mkv

changed milestone to %Qt redesign (VLC 4.0)

added Component::Interface: Qt label

assigned to @jagannatharjun

seems like x11 compositor issue, works fine with dummy and direct compositor.

This seems to happen because the x11 compositor renderer always paints one frame back, this causes other problems like expand panels will appear stuck during opening animation.

A hackish fix would be

diff --git a/modules/gui/qt/maininterface/compositor_x11_renderwindow.cpp b/modules/gui/qt/maininterface/compositor_x11_renderwindow.cpp
index e98683cdd4..aa645c925d 100644
--- a/modules/gui/qt/maininterface/compositor_x11_renderwindow.cpp
+++ b/modules/gui/qt/maininterface/compositor_x11_renderwindow.cpp
@@ -132,10 +132,13 @@ void RenderTask::onWindowSizeChanged(const QSize& newSize)
     }
     m_resizeRequested = true;
 }
-
+#include <QTimer>
 void RenderTask::requestRefresh()
 {
-    emit requestRefreshInternal(m_refreshRequestId, {});
+    QTimer::singleShot(1, this, [this]()
+    {
+        emit requestRefreshInternal(m_refreshRequestId, {});
+    });
 }
 
 void RenderTask::onInterfaceSurfaceChanged(CompositorX11RenderClient* surface)

I am not able to pinpoint point exact cause.

(cc @chub )

Maybe damage is not handled or propagated to the whole composition tree and is always late?

unassigned @jagannatharjun

mentioned in merge request !2450 (merged)

closed with commit 4c6903e7

closed with merge request !2450 (merged)

added Status::fixed label

changed milestone to %4.0