Windows borderless windows interact better with the window manager

This behavior more closely matches other platform where the window is borderless but still interacts with the window manager (e.g. task bar shows above it, it can be resized to fit within usable desktop area, etc.)

If you want a borderless window the size of the desktop that looks like a fullscreen window, then you should use the SDL_WINDOW_FULLSCREEN_DESKTOP flag.

Fixes https://github.com/libsdl-org/SDL/issues/6659

src/video/windows/SDL_windowswindow.c

@@ -79,20 +79,7 @@ GetWindowStyle(SDL_Window * window)
         style |= STYLE_FULLSCREEN;
     } else {
         if (window->flags & SDL_WINDOW_BORDERLESS) {
-            /* SDL 2.1:
-               This behavior more closely matches other platform where the window is borderless
-               but still interacts with the window manager (e.g. task bar shows above it, it can
-               be resized to fit within usable desktop area, etc.) so this should be the behavior
-               for a future SDL release.
-
-               If you want a borderless window the size of the desktop that looks like a fullscreen
-               window, then you should use the SDL_WINDOW_FULLSCREEN_DESKTOP flag.
-             */
-            if (SDL_GetHintBoolean("SDL_BORDERLESS_WINDOWED_STYLE", SDL_FALSE)) {
-                style |= STYLE_BORDERLESS_WINDOWED;
-            } else {
-                style |= STYLE_BORDERLESS;
-            }
+            style |= STYLE_BORDERLESS_WINDOWED;
         } else {
             style |= STYLE_NORMAL;
         }