Platform: don't let GLFW change CWD on Apple platforms.

What a weird default.

doc/changelog.dox

@@ -664,6 +664,9 @@ See also:
     prevents computer from entering a power-saving mode while the application
     is running, as that's generally undesirable for regular GUI applications.
     See @ref Platform-Sdl2Application-usage-power for more information.
+-   @ref Platform::GlfwApplication now overrides GLFW's default behavior that
+    changes current working directory to `Resources/` in the app bundle on
+    Apple platforms.
 
 @subsubsection changelog-latest-changes-scenegraph SceneGraph library
 

src/Magnum/Platform/GlfwApplication.cpp

@@ -93,7 +93,14 @@ GlfwApplication::GlfwApplication(const Arguments& arguments, NoCreateT):
     glfwSetErrorCallback([](int, const char* const description) {
         Error{} << description;
     });
-
+    #ifdef CORRADE_TARGET_APPLE
+    /* Don't change current working directory to Resources/ in the app bundle
+       on Apple platforms. Not sure why this would be done only on a single
+       platform of all, I guess it was for compatibility with SDL1 (and then
+       SDL2+ doesn't do this anymore but in GLFW it stays)?
+        https://wiki.libsdl.org/SDL2/README/macos#working-directory */
+    glfwInitHint(GLFW_COCOA_CHDIR_RESOURCES, false);
+    #endif
     if(!glfwInit()) {
         Error() << "Could not initialize GLFW";
         std::exit(8);