nixpkgs fix for Signal-Desktop problems

fix-signal-desktop.patch

From 07c44f9cee29524f7e82c7d422942b423f4c6f7e Mon Sep 17 00:00:00 2001
From: Ivan Kozik <[email protected]>
Date: Mon, 24 Dec 2018 07:59:33 +0000
Subject: [PATCH] signal-desktop: add flags --disable-smooth-scrolling
 --disable-gpu

---
 .../instant-messengers/signal-desktop/default.nix          | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/pkgs/applications/networking/instant-messengers/signal-desktop/default.nix b/pkgs/applications/networking/instant-messengers/signal-desktop/default.nix
index 9dd9a0d3334..f9980a75a1e 100644
--- a/pkgs/applications/networking/instant-messengers/signal-desktop/default.nix
+++ b/pkgs/applications/networking/instant-messengers/signal-desktop/default.nix
@@ -82,9 +82,16 @@ in stdenv.mkDerivation rec {
     # Patch signal
     patchelf --set-interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" \
              --set-rpath ${rpath}:$out/libexec $out/libexec/signal-desktop
+
+    # --disable-smooth-scrolling because it's annoying
+    # --disable-gpu because of Electron problems:
+    #   https://github.com/signalapp/Signal-Desktop/issues/2971
+    #   https://github.com/signalapp/Signal-Desktop/issues/2741#issuecomment-447192904
     wrapProgram $out/libexec/signal-desktop \
       --prefix XDG_DATA_DIRS : "${gtk3}/share/gsettings-schemas/${gtk3.name}/" \
       --prefix LD_LIBRARY_PATH : "${stdenv.cc.cc.lib}/lib" \
+      --add-flags "--disable-smooth-scrolling" \
+      --add-flags "--disable-gpu" \
       ${customLanguageWrapperArgs} \
       "''${gappsWrapperArgs[@]}"
 
-- 
2.19.2