nixos/fontconfig: add fonts.fontconfig.hinting.style option

nixos/modules/config/fonts/fontconfig.nix

@@ -65,7 +65,7 @@ let
           ${fcBool cfg.hinting.autohint}
         </edit>
         <edit mode="append" name="hintstyle">
-          <const>hintslight</const>
+          <const>${cfg.hinting.style}</const>
         </edit>
         <edit mode="append" name="antialias">
           ${fcBool cfg.antialias}
@@ -226,7 +226,6 @@ in
     (mkRenamedOptionModule [ "fonts" "fontconfig" "ultimate" "useEmbeddedBitmaps" ] [ "fonts" "fontconfig" "useEmbeddedBitmaps" ])
     (mkRenamedOptionModule [ "fonts" "fontconfig" "ultimate" "forceAutohint" ] [ "fonts" "fontconfig" "forceAutohint" ])
     (mkRenamedOptionModule [ "fonts" "fontconfig" "ultimate" "renderMonoTTFAsBitmap" ] [ "fonts" "fontconfig" "renderMonoTTFAsBitmap" ])
-    (mkRemovedOptionModule [ "fonts" "fontconfig" "hinting" "style" ] "")
     (mkRemovedOptionModule [ "fonts" "fontconfig" "forceAutohint" ] "")
     (mkRemovedOptionModule [ "fonts" "fontconfig" "renderMonoTTFAsBitmap" ] "")
     (mkRemovedOptionModule [ "fonts" "fontconfig" "dpi" ] "Use display server-specific options")
@@ -349,6 +348,20 @@ in
               fonts, but better than unhinted fonts.
             '';
           };
+
+          style = mkOption {
+            type = types.enum [ "hintnone" "hintslight" "hintmedium" "hintfull" ];
+            default = "hintslight";
+            description = ''
+              Hintstyle is the amount of font reshaping done to line up
+              to the grid.
+
+              hintslight will make the font more fuzzy to line up to the grid
+              but will be better in retaining font shape, while hintfull will
+              be a crisp font that aligns well to the pixel grid but will lose
+              a greater amount of font shape.
+            '';
+          };
         };
 
         includeUserConf = mkOption {