Can we not crash on bad clipboard?

[installgentoo]

GLFW_FORMAT_UNAVAILABLE   0x00010009

Analysis
    If emitted during window creation, one or more [hard constraints](https://www.glfw.org/docs/3.3/window_guide.html#window_hints_hard) did not match any of the available pixel formats. If your application is sufficiently flexible, downgrade your requirements and try again. Otherwise, inform the user that their machine does not match your requirements.

    If emitted when querying the clipboard, ignore the error or report it to the user, as appropriate.

Right now if you put some /dev/random into clipboard on X11, glfw callbacks an error, which crashes the application if you care about errors. There's no way to filter this, besides matching a string in glfw callback. Can we instead return a Result from get_clipboard_string() ?