Problem:
`menu_mode_chars` includes the two-character `"tl"` value. The hardcoded
`1` is the `key_len` argument of `tv_dict_add_dict()`, which truncated
it to `"t"`, the designator for a tooltip. Scripts keying on the
documented mode designators therefore miss terminal mode entries and
misread them as tooltips.
Solution:
Pass the real length of the designator.
AI-assisted
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