fluffychat: use software rendering to fix for moby

modules/universal/env/home-packages.nix

@@ -53,7 +53,7 @@ let
 
     emote  # TODO: package [smile](https://github.com/mijorus/smile) for probably a better mobile experience.
     evince  # works on phosh
-    fluffychat
+    fluffychat-moby  # TODO: ship normal fluffychat on non-moby?
     foliate
     font-manager
     gimp  # broken on phosh

pkgs/fluffychat-moby/default.nix

@@ -0,0 +1,15 @@
+{ pkgs }:
+
+(pkgs.symlinkJoin {
+  name = "fluffychat-moby";
+  paths = [ pkgs.fluffychat ];
+  buildInputs = [ pkgs.makeWrapper ];
+  # ordinary fluffychat on moby displays blank window;
+  # > Failed to start Flutter renderer: Unable to create a GL context
+  # this is temporarily solved by using software renderer
+  # - see https://github.com/flutter/flutter/issues/106941
+  postBuild = ''
+    wrapProgram $out/bin/fluffychat \
+      --set LIBGL_ALWAYS_SOFTWARE 1
+  '';
+})

pkgs/overlay.nix

@@ -21,6 +21,7 @@
   };
 
   #### customized packages
+  fluffychat-moby = prev.callPackage ./fluffychat-moby { pkgs = prev; };
   # nixos-unstable pleroma is too far out-of-date for our db
   pleroma = prev.callPackage ./pleroma { };
   # jackett doesn't allow customization of the bind address: this will probably always be here.