nimble file should probably not use @#head

[c-blake]

See c-blake/hldiff#1 (comment) and subsequent.

Seems you wanted some May 2017 version of sdl2_nim. The git hash you probably want is something like 213ee80f8fc4ec2d4dfedd02ee091dbfd336983f

[jangko]

breaking changes in sdl2_nim?

[c-blake]

It's really more an issue that nimble never updates the @#head version after it is first installed. This surprised me. I would have thought it was "always updated". Instead they are telling us in the first paragraph of that linked comment by @genotrance that @#head is actually "never updated" after the initial install.

In case the perils of "never updated" are not obvious..As a concrete example, if someone installed your package on May 20, 2017 (the day after you added sdl2_nim@#head to your nimble) and never removed that @#head version from pkgs/ then it will never have been updated since 2017. But it's even worse! If another package did requires sdl2_nim@#head before you, and a user had it installed in the shared pkgs/ then it may have caused that @#head slot to be allocated and never updated ever after. If nimAGG needed sdl2_nim features/bug fixes from any time after this unknowable-to-you point in time it would fail.

In short, because of the way nimble operates and @#head, in some nimAGG user's shared install pkgs/ directory the installed and used sdl2_nim@#head could be as old as 2013 or as new as 2020.