Resizable windows start "scaling up" after a point

[cyberarm]

See video: https://youtu.be/xE2LUiSjiL0

[cyberarm]

Seems to be affected by https://github.com/gosu/gosu/blob/master/src/Window.cpp#L192-L193

// If the window is resizable, limit its size, without preserving the aspect ratio.
width  = actual_width  = min(width,  max_width);
height = actual_height = min(height, max_height);

[jlnr]

Whoops, well that's not great. Thanks for reporting!

[jlnr]

I have not been able to reproduce any of these issues on macOS, but things seem to be broken in various ways on Linux (elementary, based on Ubuntu 18.04 with SDL 2.0.8).

[jlnr]

I think one issue is that SDL_SetWindowSize does not affect maximized (not fullscreen) windows, so Gosu thinks the window size has changed when it hasn't. This might also affect Windows, not sure.

[jlnr]

My current plan would be to separate the responsibilities of Window::resize - it should only remember some state and call SDL_SetWindowSize, and the SDL_WINDOWEVENT_SIZE_CHANGED handler should perform the necessary changes to Gosu::Graphics (OpenGL) and Gosu::Input. But I'll go and try to release a new Ruby.app for macOS first before I try something as risky as this refactoring :)