Merge branch 'master' into staging-next

Fixed trivial conflicts caused by removing rec.

pkgs/data/themes/adementary/default.nix

@@ -27,7 +27,7 @@ stdenv.mkDerivation rec {
   '';
 
   meta = with stdenv.lib; {
-    description = "Adwaita-based gtk+ theme with design influence from elementary OS and Vertex gtk+ theme";
+    description = "Adwaita-based GTK theme with design influence from elementary OS and Vertex GTK theme";
     homepage    = https://github.com/hrdwrrsk/adementary-theme;
     license     = licenses.gpl3;
     maintainers = with maintainers; [ dtzWill ];

pkgs/data/themes/greybird/default.nix

@@ -29,7 +29,7 @@ stdenv.mkDerivation rec {
   ];
 
   meta = with stdenv.lib; {
-    description = "Grey and blue theme from the Shimmer Project for GTK+-based environments";
+    description = "Grey and blue theme from the Shimmer Project for GTK-based environments";
     homepage = https://github.com/shimmerproject/Greybird;
     license = with licenses; [ gpl2Plus ]; # or alternatively: cc-by-nc-sa-30
     platforms = platforms.linux;

pkgs/data/themes/materia-theme/default.nix

@@ -29,7 +29,7 @@ stdenv.mkDerivation rec {
   '';
 
   meta = with stdenv.lib; {
-    description = "Material Design theme for GNOME/GTK+ based desktop environments";
+    description = "Material Design theme for GNOME/GTK based desktop environments";
     homepage = https://github.com/nana-4/materia-theme;
     license = licenses.gpl2;
     platforms = platforms.all;

pkgs/data/themes/plata/default.nix

@@ -82,7 +82,7 @@ stdenv.mkDerivation rec {
   '';
 
   meta = with stdenv.lib; {
-    description = "A Gtk+ theme based on Material Design Refresh";
+    description = "A GTK theme based on Material Design Refresh";
     homepage = https://gitlab.com/tista500/plata-theme;
     license = with licenses; [ gpl2 cc-by-sa-40 ];
     platforms = platforms.linux;