FileManager: Apply wallpaper on startup

I noticed that nothing actually applies the wallpaper on startup.
I wasn't sure where to put the responsibility, so I gave it to
the desktop mode file manager.

Also adds a save_config option to set_wallpaper so it doesn't
needlessly save the config.

1 files changed, 7 insertions, 0 deletions

diff --git a/Applications/FileManager/main.cpp b/Applications/FileManager/main.cpp
index 2cdd992c13..11becb159c 100644
--- a/Applications/FileManager/main.cpp
+++ b/Applications/FileManager/main.cpp
@@ -40,6 +40,7 @@
 #include <LibGUI/Application.h>
 #include <LibGUI/BoxLayout.h>
 #include <LibGUI/Clipboard.h>
+#include <LibGUI/Desktop.h>
 #include <LibGUI/FileSystemModel.h>
 #include <LibGUI/InputBox.h>
 #include <LibGUI/Label.h>
@@ -242,6 +243,12 @@ int run_in_desktop_mode(RefPtr<Core::ConfigFile> config, String initial_location
             desktop_view_context_menu->popup(event.screen_position());
     };
 
+    auto wm_config = Core::ConfigFile::get_for_app("WindowManager");
+    auto selected_wallpaper = wm_config->read_entry("Background", "Wallpaper", "");
+    if (!selected_wallpaper.is_empty()) {
+        GUI::Desktop::the().set_wallpaper(selected_wallpaper, false);
+    }
+
     window->show();
     return GUI::Application::the()->exec();
 }