plasma-workspace: backport fix recommended by upstream

See https://mail.kde.org/pipermail/distributions/2023-August/001396.html

pkgs/desktops/plasma-5/plasma-workspace/default.nix

@@ -65,6 +65,7 @@
 , polkit-qt
 , pipewire
 , libdrm
+, fetchpatch
 }:
 
 let inherit (lib) getBin getLib; in
@@ -147,6 +148,13 @@ mkDerivation {
   patches = [
     ./0001-startkde.patch
     ./0002-absolute-wallpaper-install-dir.patch
+
+    # backport patch fixing a Wayland crash
+    # FIXME: remove in next release
+    (fetchpatch {
+      url = "https://invent.kde.org/plasma/plasma-workspace/-/commit/fc01a7f837d06ee9e92d02f13acb79c2b06e9e3c.diff";
+      hash = "sha256-cHupiD6fKZ7ICFb4AcuUErrA4646sNGxeGiACPs8IHQ=";
+    })
   ];
 
   # QT_INSTALL_BINS refers to qtbase, and qdbus is in qttools