vanadium: patch helix so I have W command

nix/configurations/vanadium/overlay.nix

@@ -23,6 +23,11 @@ in
     vlc.__input.chromecastSupport = _: false;
     vlc.__input.waylandSupport = _: false;
 
+    # I don't really use helix, but it's nice to have the W alias just in case
+    helix.__output.patches.__append = [
+      ./patches/helix/W-as-write.patch
+    ];
+
     fcitx5.__output.cmakeFlags.__append = [
       (lib.cmakeFeature "ENABLE_EMOJI" "Off")
       (lib.cmakeFeature "ENABLE_WAYLAND" "Off")

nix/configurations/vanadium/patches/helix/W-as-write.patch

@@ -0,0 +1,13 @@
+diff --git a/helix-term/src/commands/typed.rs b/helix-term/src/commands/typed.rs
+index 2013a9d8..e1673e68 100644
+--- a/helix-term/src/commands/typed.rs
++++ b/helix-term/src/commands/typed.rs
+@@ -2705,7 +2705,7 @@ fn noop(_cx: &mut compositor::Context, _args: Args, _event: PromptEvent) -> anyh
+     },
+     TypableCommand {
+         name: "write",
+-        aliases: &["w"],
++        aliases: &["w", "W"], // I type too fast
+         doc: "Write changes to disk. Accepts an optional path (:write some/path.txt)",
+         fun: write,
+         completer: CommandCompleter::positional(&[completers::filename]),