sublime-merge: remove GTK 2 support

Sublime Merge does not support GTK 2 from build 1092 so we do not need this anymore.

Also brings the expression in sync with Sublime Text.

pkgs/applications/version-management/sublime-merge/common.nix

@@ -1,12 +1,10 @@
 { buildVersion, sha256, dev ? false }:
 
-{ fetchurl, stdenv, xorg, glib, glibcLocales, gtk2, gtk3, cairo, pango, libredirect, makeWrapper, wrapGAppsHook
-, pkexecPath ? "/run/wrappers/bin/pkexec", gksuSupport ? false, gksu
+{ fetchurl, stdenv, xorg, glib, glibcLocales, gtk3, cairo, pango, libredirect, makeWrapper, wrapGAppsHook
+, pkexecPath ? "/run/wrappers/bin/pkexec"
 , writeScript, common-updater-scripts, curl, gnugrep
 }:
 
-assert gksuSupport -> gksu != null;
-
 let
   pname = "sublime-merge";
   packageAttribute = "sublime-merge${stdenv.lib.optionalString dev "-dev"}";
@@ -17,13 +15,11 @@ let
   downloadArchiveType = "tar.xz";
   versionUrl = "https://www.sublimemerge.com/${if dev then "dev" else "download"}";
   versionFile = "pkgs/applications/version-management/sublime-merge/default.nix";
-  usesGtk2 = false;
   archSha256 = sha256;
   arch = "x64";
 
-  libPath = stdenv.lib.makeLibraryPath [ xorg.libX11 glib (if usesGtk2 then gtk2 else gtk3) cairo pango ];
-  redirects = [ "/usr/bin/pkexec=${pkexecPath}" ]
-    ++ stdenv.lib.optional gksuSupport "/usr/bin/gksudo=${gksu}/bin/gksudo";
+  libPath = stdenv.lib.makeLibraryPath [ xorg.libX11 glib gtk3 cairo pango ];
+  redirects = [ "/usr/bin/pkexec=${pkexecPath}" ];
 in let
   binaryPackage = stdenv.mkDerivation {
     pname = "${pname}-bin";
@@ -37,8 +33,8 @@ in let
 
     dontStrip = true;
     dontPatchELF = true;
-    buildInputs = stdenv.lib.optionals (!usesGtk2) [ glib gtk3 ]; # for GSETTINGS_SCHEMAS_PATH
-    nativeBuildInputs = [ makeWrapper ] ++ stdenv.lib.optional (!usesGtk2) wrapGAppsHook;
+    buildInputs = [ glib gtk3 ]; # for GSETTINGS_SCHEMAS_PATH
+    nativeBuildInputs = [ makeWrapper wrapGAppsHook ];
 
     buildPhase = ''
       runHook preBuild
@@ -50,7 +46,7 @@ in let
           $binary
       done
 
-      # Rewrite pkexec|gksudo argument. Note that we can't delete bytes in binary.
+      # Rewrite pkexec argument. Note that we cannot delete bytes in binary.
       sed -i -e 's,/bin/cp\x00,cp\x00\x00\x00\x00\x00\x00,g' ${primaryBinary}
 
       runHook postBuild
@@ -72,7 +68,7 @@ in let
         --set LD_PRELOAD "${libredirect}/lib/libredirect.so" \
         --set NIX_REDIRECTS ${builtins.concatStringsSep ":" redirects} \
         --set LOCALE_ARCHIVE "${glibcLocales.out}/lib/locale/locale-archive" \
-        ${stdenv.lib.optionalString (!usesGtk2) ''"''${gappsWrapperArgs[@]}"''}
+        "''${gappsWrapperArgs[@]}"
     '';
   };
 in stdenv.mkDerivation (rec {