Follow-up Comment #2, bug #21969 (project wesnoth):
I did an experiment with removing deleted hot-keys from the hot-keys vector
instead of marking them as 'null'. I think there are complications with how
the vector is stored in memory, when it is written to the preferences text
file, and how hot-keys are detected (command != "null") when reading/writing
the hot-keys vector.
...but after all that, I discovered that it's much simpler just to cull the
null commands at the save preferences step. I've submitted PR #530 for this -
it will be included whenever the sdl2 branch gets merged to master.
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