Add kde patches

The nixpkgs patch is to clear out a conflict with a patch that's applied
to plasma-workspace by nixpkgs

roles/kde/patches/kwin/pr7829.patch

@@ -0,0 +1,85 @@
+From 4ddb4a23d5f453cf890c9f1b1aa5429150991db3 Mon Sep 17 00:00:00 2001
+From: David Redondo <kde@david-redondo.de>
+Date: Thu, 26 Jun 2025 17:00:07 +0200
+Subject: [PATCH] scene: Skip visibility check for the Item itself in
+ framePainted
+
+Fixes offscreen rendering and window thumbnails for hidden windows
+not udpating.
+Co-authored-by: Vlad Zahorodnii <vlad.zahorodnii@kde.org>
+---
+ src/scene/item.cpp     | 9 +++++----
+ src/scene/item.h       | 2 +-
+ src/scene/rootitem.cpp | 9 ---------
+ src/scene/rootitem.h   | 2 --
+ 4 files changed, 6 insertions(+), 16 deletions(-)
+
+diff --git a/src/scene/item.cpp b/src/scene/item.cpp
+index 2637a131dbd..eb2b6b46977 100644
+--- a/src/scene/item.cpp
++++ b/src/scene/item.cpp
+@@ -648,12 +648,13 @@ void Item::removeEffect()
+ 
+ void Item::framePainted(Output *output, OutputFrame *frame, std::chrono::milliseconds timestamp)
+ {
+-    if (!isVisible() || workspace()->outputAt(mapToScene(boundingRect()).center()) != output) {
+-        return;
+-    }
++    // The visibility of the item itself is not checked here to be able to paint hidden items for
++    // things like screncasts or thumbnails
+     handleFramePainted(output, frame, timestamp);
+     for (const auto child : std::as_const(m_childItems)) {
+-        child->framePainted(output, frame, timestamp);
++        if (child->explicitVisible() && workspace()->outputAt(child->mapToScene(child->boundingRect()).center()) == output) {
++            child->framePainted(output, frame, timestamp);
++        }
+     }
+ }
+ 
+diff --git a/src/scene/item.h b/src/scene/item.h
+index acb29994328..d42b32abf7b 100644
+--- a/src/scene/item.h
++++ b/src/scene/item.h
+@@ -144,7 +144,7 @@ public:
+     void addEffect();
+     void removeEffect();
+ 
+-    virtual void framePainted(Output *output, OutputFrame *frame, std::chrono::milliseconds timestamp);
++    void framePainted(Output *output, OutputFrame *frame, std::chrono::milliseconds timestamp);
+ 
+     bool isAncestorOf(const Item *item) const;
+ 
+diff --git a/src/scene/rootitem.cpp b/src/scene/rootitem.cpp
+index fe0cecc76e3..466a25ce828 100644
+--- a/src/scene/rootitem.cpp
++++ b/src/scene/rootitem.cpp
+@@ -14,13 +14,4 @@ RootItem::RootItem(Scene *scene)
+     setScene(scene);
+ }
+ 
+-void RootItem::framePainted(Output *output, OutputFrame *frame, std::chrono::milliseconds timestamp)
+-{
+-    handleFramePainted(output, frame, timestamp);
+-    const auto children = childItems();
+-    for (const auto child : children) {
+-        child->framePainted(output, frame, timestamp);
+-    }
+-}
+-
+ } // namespace KWin
+diff --git a/src/scene/rootitem.h b/src/scene/rootitem.h
+index 45fa1359c84..43b3cdb90e9 100644
+--- a/src/scene/rootitem.h
++++ b/src/scene/rootitem.h
+@@ -20,8 +20,6 @@ class KWIN_EXPORT RootItem : public Item
+ 
+ public:
+     explicit RootItem(Scene *scene);
+-
+-    void framePainted(Output *output, OutputFrame *frame, std::chrono::milliseconds timestamp) override;
+ };
+ 
+ } // namespace KWin
+-- 
+GitLab
+