KeyboardMapperWidget's load_map_from_file, load_map_from_system, save,
and save_to_file now all return ErrorOr<void> and no longer handles
alerting the user to potential errors.
main is now responsible for handling errors originating from its calls
to these four functions; it will simply alert the user using the new
method KeyboardMapperWidget::show_error_to_user(Error), which simply
creates a MassageBox displaying the error's string_literal.
This makes the whole program slight more clean feeling :^).
Extract the mapping of a name to a character map into its own method.
This only slightly reduces the number of lines, going from 24 to 17
lines, but makes the code somewhat more readable and reduces repetition.
Extract the creation of map-selection radio buttons from create_frame
into the new private method add_map_radio_button(map_name, button_text)
turning 24 lines into 4 + 6 lines. This makes create_frame a little
easier to read. :^)
Derivatives of Core::Object should be constructed through
ClassName::construct(), to avoid handling ref-counted objects with
refcount zero. Fixing the visibility means that misuses like this are
more difficult.
SPDX License Identifiers are a more compact / standardized
way of representing file license information.
See: https://spdx.dev/resources/use/#identifiers
This was done with the `ambr` search and replace tool.
ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
