Make it possible to resize window

[stianval]

Another feature for parity with SDL1 version

Issue #3

[simenheg]

Great stuff @stianval, resizing now seems to work like in the SDL1 version! Thanks. :)

However this seems to introduce some new problems with the fullscreen mode:

• When maximizing the screen and then going into fullscreen mode, the screen seems to be cropped/overflow at the bottom (this is easiest to see with the "show border" option turned on.
• The screen turns black sometimes when in fullscreen mode, sometimes also immediately when entering the game. The menu and sounds still work, but nothing is rendered.

[stianval]

Happy new year @simenheg!

Confirming I can reproduce the problem when maximizing the window and then going to fullscreen. The reason is not entirely clear, so I may have to spend some time on it.

The screen turns black sometimes when in fullscreen mode, sometimes also immediately when entering the game. The menu and sounds still work, but nothing is rendered.

Is this also only after maximizing the screen and then going to fullscreen, or does this happen other times as well?

[simenheg]

Hey @stianval, sorry for replying so late.

The screen turns black sometimes when in fullscreen mode, sometimes also immediately when entering the game. The menu and sounds still work, but nothing is rendered.

Is this also only after maximizing the screen and then going to fullscreen, or does this happen other times as well?

The screen doesn't need to be maximized for it to happen.