Application: rely on Granite.StyleManager (#423)

Granite.StyleManager handles dark mode since 7.7.0

Author: danirabbit

README.md

@@ -9,7 +9,7 @@ You'll need the following dependencies:
 * libadwaita-1-dev
 * glib-2.0
 * gobject-2.0
-* granite-7 >=7.0.0
+* granite-7 >=7.7.0
 * gtk4 >=4.12
 * libecal-2.0
 * libedataserver-1.2

meson.build

@@ -30,7 +30,7 @@ libecal_dep = dependency('libecal-2.0')
 tasks_deps = [
     dependency('glib-2.0', version: '>=2.68'),
     dependency('gobject-2.0'),
-    dependency('granite-7', version: '>=7.0.0'),
+    dependency('granite-7', version: '>=7.7.0'),
     dependency('gtk4', version: '>=4.12'),
     libecal_dep,
     dependency('libadwaita-1', version: '>=1.4'),

src/Application.vala

@@ -56,15 +56,6 @@ public class Tasks.Application : Gtk.Application {
 
         Granite.init ();
 
-        unowned var granite_settings = Granite.Settings.get_default ();
-        unowned var gtk_settings = Gtk.Settings.get_default ();
-
-        gtk_settings.gtk_application_prefer_dark_theme = granite_settings.prefers_color_scheme == DARK;
-
-        granite_settings.notify["prefers-color-scheme"].connect ((obj, pspec) => {
-            gtk_settings.gtk_application_prefer_dark_theme = ((Granite.Settings) obj).prefers_color_scheme == DARK;
-        });
-
         var quit_action = new SimpleAction ("quit", null);
         quit_action.activate.connect (() => {
             if (active_window != null) {