Platform: leave Sdl2Application window positioning on the system.

src/Magnum/Platform/Sdl2Application.cpp

@@ -165,7 +165,7 @@ bool Sdl2Application::tryCreateContext(const Configuration& configuration) {
 
     /* Create window */
     if(!(_window = SDL_CreateWindow(configuration.title().data(),
-        SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
+        SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
         configuration.size().x(), configuration.size().y(),
         SDL_WINDOW_OPENGL|windowFlags)))
     {
@@ -211,7 +211,7 @@ bool Sdl2Application::tryCreateContext(const Configuration& configuration) {
         SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, int(configuration.flags()));
 
         if(!(_window = SDL_CreateWindow(configuration.title().data(),
-            SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
+            SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
             configuration.size().x(), configuration.size().y(),
             SDL_WINDOW_OPENGL|windowFlags)))
         {

src/Magnum/Platform/Sdl2Application.h

@@ -534,8 +534,8 @@ CORRADE_ENUMSET_OPERATORS(Sdl2Application::Flags)
 /**
 @brief Configuration
 
-The created window is always centered with double-buffered OpenGL context and
-24bit depth buffer.
+The created window is always with double-buffered OpenGL context and 24bit
+depth buffer.
 @see @ref Sdl2Application(), @ref createContext(), @ref tryCreateContext()
 */
 class Sdl2Application::Configuration {