kitty: Workaround fcitx5 issue

Trunk versions of Kitty have a fix for a new fcitx5 problem that has not
been released yet. See kovidgoyal/kitty#7396.

modules/programs/kitty/default.nix

@@ -3,5 +3,19 @@
   config = {
     environment.etc."xdg/kitty/kitty.conf".source = ./kitty.conf;
     environment.systemPackages = with pkgs; [ kitty ];
+
+    nixpkgs.overlays = [
+      (final: prev: {
+        kitty = prev.kitty.overrideAttrs (prevAttrs: {
+          patches = (prevAttrs.patches or [ ]) ++ [
+            (pkgs.fetchpatch {
+              name = "fcitx-workaround.diff";
+              url = "https://github.com/kovidgoyal/kitty/commit/aecf07bcbaa74507526d3f700954842176fef4f2.diff";
+              hash = "sha256-6m4D/xX5dx0v6rhzIyTlkQyCRb2Ik2Ek3q0BrL3saTw=";
+            })
+          ];
+        });
+      })
+    ];
   };
 }