Change normal and visual mode behavior more strict #8
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It changes normal and visual mode behavior to cancel all the unassigned characters, to prevent accidentally input an unassigned(but exists in vim) character like "w" or "b". I thought no-op is better than accidental input.
It does not cancel a key event if the key is pressed with ctrl or meta, not to mask Google Sheets' default shortcuts such as ⌘-F.
It also adds explicit arrow key mappings to prevent canceling them because of the above change.