wvkbd: change default key border 2 -> 1 px

since moby is scaled 2x, it's actually 2 px *in practice*

hosts/common/programs/wvkbd.nix

@@ -1,9 +1,16 @@
-{ config, ... }:
+{ config, pkgs, ... }:
 let
   cfg = config.sane.programs.wvkbd;
 in
 {
   sane.programs.wvkbd = {
+    packageUnwrapped = pkgs.wvkbd.overrideAttrs (base: {
+      postPatch = (base.postPatch or "") + ''
+        substituteInPlace layout.mobintl.h \
+          --replace-fail '#define KBD_KEY_BORDER 2' '#define KBD_KEY_BORDER 1'
+      '';
+    });
+
     sandbox.method = "bwrap";
     sandbox.whitelistWayland = true;
 
@@ -37,6 +44,8 @@ in
       environment.WVKBD_LAYERS = "full,special,emoji";
       environment.WVKBD_HEIGHT = "216";  #< default: 250 (pixels)
       # environment.WVKBD_LANDSCAPE_HEIGHT = "??";  #< default: 120 (pixels)
+      # more settings tunable inside config.h when compiling:
+      # - KBD_KEY_BORDER = 2
     };
   };
 }