make-context takes :log-limit, the most log messages a context keeps,
which was a fixed 100. The reference, Contexts and Keymaps, and Errors
and Logging say so, and Errors and Logging says that an error reports
only the messages of the compile that failed. modifier-active-p lists
the modifier keywords in the order active-modifiers returns them, and
Platforms and Testing names the environment among what cl-xkbcommon
takes from SBCL.
