Add dev-qt from an older version of the gentoo repo

Qt5 has been removed, we restore it since we still use it.

dev-qt/qtwayland/files/qtwayland-6.9.0-reset-mframe.patch

@@ -0,0 +1,60 @@
+Backport recommended by KDE[1].
+
+[1] https://invent.kde.org/qt/qt/qtwayland/-/commit/e4556c59f0c8250da7c16759432b2ac0a5ac9d9f
+[2] https://mail.kde.org/pipermail/distributions/2025-April/001575.html
+From e4556c59f0c8250da7c16759432b2ac0a5ac9d9f Mon Sep 17 00:00:00 2001
+From: Vlad Zahorodnii <vlad.zahorodnii@kde.org>
+Date: Mon, 31 Mar 2025 11:40:12 +0300
+Subject: [PATCH] Client: Reset mFrameCallbackTimedOut when showing a window
+
+When a window is hidden, the corresponding expose event is sent
+asynchronously. So, a buffer (and a frame callback) can be attached
+after the window is hidden.
+
+QWaylandWindow::initWindow() handles that case by attaching a nil buffer
+to the surface, but it skips resetting the frame callback things.
+
+If mFrameCallbackTimedOut is not reset, then the window can get stuck
+in the unexposed state and not show up after the second setVisible(true).
+
+This change makes the initWindow() function also reset frame callback
+data. It fixes some windows not showing up after remapping them.
+--- a/src/client/qwaylandwindow.cpp
++++ b/src/client/qwaylandwindow.cpp
+@@ -107,4 +107,5 @@
+     mSurface->attach(nullptr, 0, 0);
+     mSurface->commit();
++    resetFrameCallback();
+ 
+     if (window()->type() == Qt::Desktop)
+@@ -326,4 +327,13 @@
+     delete std::exchange(mSubSurfaceWindow, nullptr);
+     emit surfaceRoleDestroyed();
++
++    resetFrameCallback();
++    mInFrameRender = false;
++    mWaitingToApplyConfigure = false;
++    mExposed = false;
++}
++
++void QWaylandWindow::resetFrameCallback()
++{
+     {
+         QMutexLocker lock(&mFrameSyncMutex);
+@@ -339,8 +349,5 @@
+         mFrameCallbackCheckIntervalTimerId = -1;
+     }
+-    mInFrameRender = false;
+     mFrameCallbackTimedOut = false;
+-    mWaitingToApplyConfigure = false;
+-    mExposed = false;
+ }
+ 
+--- a/src/client/qwaylandwindow_p.h
++++ b/src/client/qwaylandwindow_p.h
+@@ -352,4 +352,5 @@
+     bool shouldCreateSubSurface() const;
+     void resetSurfaceRole();
++    void resetFrameCallback();
+     QPlatformScreen *calculateScreenFromSurfaceEvents() const;
+     void setOpaqueArea(const QRegion &opaqueArea);