Closes #ISSUE
This PR attempts to add workarounds for `use_key_equivalents` in the
keymap UI. First of all it makes it so that `use_key_equivalents` is
ignored when searching for a binding to replace so that replacing a
keybind with `use_key_equivalents` set to true does not result in a new
binding. Second, it attempts to infer the value of `use_key_equivalents`
off of a base binding when adding a binding by adding an optional `from`
parameter to the `KeymapUpdateOperation::Add` variant. Neither
workaround will work when the `from` binding for an add or the `target`
binding for a replace are not in the user keymap.
cc: @Anthony-Eid
Release Notes:
- N/A *or* Added/Fixed/Improved ...
21b4a2ecdd