Ensure current desktop mode is also a fullscreen mode

Port of PR #3331

changelog.md

@@ -88,7 +88,7 @@ For a closer look at breaking changes and how to migrate from SFML 2, check out
 -   [Windows] Fixed F13-F24 and consumer key names not being returned on Windows (#2873)
 -   [Windows] Changed `sf::Context::getFunction` to return `nullptr` when called on Windows without an active context (#2925)
 -   [Linux] Fixed broken joystick axis mappings under Linux (#3167)
--   [macOS] Fixed how macOS fullscreen video modes are detected (#3151)
+-   [macOS] Fixed how macOS fullscreen video modes are detected (#3151, #3348)
 -   [macOS] Avoided unnecessary permission request prompts (#3232)
 -   [Linux] Fixed DRM mode setting to use SFML window dimensions (#3310)
 

src/SFML/Window/macOS/VideoModeImpl.cpp

@@ -40,18 +40,17 @@ namespace sf::priv
 ////////////////////////////////////////////////////////////
 std::vector<VideoMode> VideoModeImpl::getFullscreenModes()
 {
-    std::vector<VideoMode> modes;
-
     // Retrieve all modes available for main screen only.
     CFArrayRef cgmodes = CGDisplayCopyAllDisplayModes(CGMainDisplayID(), nullptr);
 
     if (cgmodes == nullptr)
     {
         sf::err() << "Couldn't get VideoMode for main display." << std::endl;
-        return modes;
+        return {};
     }
 
     const VideoMode        desktop = getDesktopMode();
+    std::vector<VideoMode> modes   = {desktop};
 
     // Loop on each mode and convert it into a sf::VideoMode object.
     const CFIndex modesCount = CFArrayGetCount(cgmodes);