This function needs a unit test.

Guide to how to contribute to an open source project on GitHub.

Test stub: https://github.com/pygame/pygame/blob/master/test/display_test.py#L184-L203
Docs: https://www.pygame.org/docs/ref/display.html#pygame.display.gl_set_attribute
Code to be tested: https://github.com/pygame/pygame/

SuperTux version: Newest nightly (began around when the DIscord RPC was implemented)
System information: (details about your kernel, operating system, or distribution) Windows 10 (?)

Expected behavior

Upon installing, SuperTux should open as usual.

Actual behavior

SuperTux does not open and crashes upon startup, giving me the message: "Libcurl.dll was not found"

From the comment in SDL_filesystem.h:
Please call SDL_free() on the pointer when you are done with it

When building the project with MSVC, I ran into some debug heap asserts early into the program startup.
The culprit appears to be the code in m_config.c that does free(prefdir) as changing these to SDL_free(prefdir) resolved the issue.

I'm not sure what to do about `GetDefaultConfi

Modify the setup.py so it produce bdist_wheel for manylinux including the libgraphqlparser.so/a
Modify the build process so this wheel is uploaded to pypi
Modify the cffi part of tartiflette/parser so it loads this lib instead of the local one.

This is related to #226, but at a lower level, improving the building blocks for widgets.

Is your feature request related to a problem? Please describe.
Standard mode has the usual keystrokes for notepad, but there are more that would probably be useful.

Describe the solution you'd like
As a first step, a quick review of the common keystrokes in notepad/wordpad/work, for example might throw up some obvious ones we could add