Force MacOS "dock" to refresh

Signed-off-by: Thibault Meyer <meyer.thibault@gmail.com>

README.md

@@ -149,6 +149,7 @@ choose the one that seems best suited to you (crontab, gnome start at launch, et
 
 * [LINUX] Only Gnome is natively supported, to use this application with another Desktop
   Environment, you have to use `exec_apply_wallpaper` option in the configuration file
+* [MACOS] Dock, don't refresh wallpaper. This application have a workaround (but sometime Dock wins)
 * [WINDOWS] Parameter `--nowindow` (or `-w`) not working if you use Terminal as default
   console. Terminal don't honor Windows API and don't allow application to detach from
   terminal. As workaround, you could create a shortcut and configure it to enable the

src/bingwallpaper/bingwallpaperchanger.rs

@@ -140,7 +140,10 @@ impl BingWallpaperChanger {
             }
 
             #[cfg(target_os = "macos")] {
-                self.change_wallpaper_macos();
+                // Loop is needed to force Dock to refresh wallpaper :(
+                for _ in 0..20 {
+                    self.change_wallpaper_macos();
+                }
             }
 
             #[cfg(target_os = "windows")] {
@@ -242,7 +245,7 @@ impl BingWallpaperChanger {
             .expect("Can't change wallpaper");
         child.wait().expect("Can't wait for child process");
 
-        std::thread::sleep(std::time::Duration::from_secs(1));
+        //std::thread::sleep(std::time::Duration::from_secs(1));
         fs::remove_file(&tmp_filename).unwrap();
         fs::remove_file(swift_script_path).unwrap();
     }